呕心沥血集齐史上最全 JavaScript最实用工具函数大全，建议收藏！

本文主要是介绍呕心沥血集齐史上最全 JavaScript最实用工具函数大全，建议收藏！，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

为元素添加on方法

Element.prototype.on = Element.prototype.addEventListener;
NodeList.prototype.on = function (event, fn) {、    []['forEach'].call(this, function (el) {        el.on(event, fn);    });    return this;};

为元素添加trigger方法

Element.prototype.trigger = function(type, data) {  var event = document.createEvent("HTMLEvents");  event.initEvent(type, true, true);  event.data = data || {};  event.eventName = type;  event.target = this;  this.dispatchEvent(event);  return this;};
NodeList.prototype.trigger = function(event) {  []["forEach"].call(this, function(el) {    el["trigger"](event);  });  return this;};

转义html标签

function HtmlEncode(text) {  return text    .replace(/&/g, "&")    .replace(/\"/g, '"')    .replace(/</g, "<")    .replace(/>/g, ">");}

HTML标签转义

// HTML 标签转义// @param {Array.<DOMString>} templateData 字符串类型的tokens// @param {...} ..vals 表达式占位符的运算结果tokens//function SaferHTML(templateData) {  var s = templateData[0];  for (var i = 1; i < arguments.length; i++) {    var arg = String(arguments[i]);    // Escape special characters in the substitution.    s += arg      .replace(/&/g, "&amp;")      .replace(/</g, "&lt;")      .replace(/>/g, "&gt;");    // Don't escape special characters in the template.    s += templateData[i];  }  return s;}// 调用var html = SaferHTML`<p>这是关于字符串模板的介绍</p>`;

跨浏览器绑定事件

function addEventSamp(obj, evt, fn) {  if (!oTarget) {    return;  }  if (obj.addEventListener) {    obj.addEventListener(evt, fn, false);  } else if (obj.attachEvent) {    obj.attachEvent("on" + evt, fn);  } else {    oTarget["on" + sEvtType] = fn;  }}

加入收藏夹

function addFavorite(sURL, sTitle) {  try {    window.external.addFavorite(sURL, sTitle);  } catch (e) {    try {      window.sidebar.addPanel(sTitle, sURL, "");    } catch (e) {      alert("加入收藏失败，请使用Ctrl+D进行添加");    }  }}

提取页面代码中所有网址

var aa = document.documentElement.outerHTML  .match(    /(url\(|src=|href=)[\"\']*([^\"\'\(\)\<\>\[\] ]+)[\"\'\)]*|(http:\/\/[\w\-\.]+[^\"\'\(\)\<\>\[\] ]+)/gi  )  .join("\r\n")  .replace(/^(src=|href=|url\()[\"\']*|[\"\'\>\) ]*$/gim, "");alert(aa);

动态加载脚本文件

function appendscript(src, text, reload, charset) {  var id = hash(src + text);  if (!reload && in_array(id, evalscripts)) return;  if (reload && $(id)) {    $(id).parentNode.removeChild($(id));  }
  evalscripts.push(id);  var scriptNode = document.createElement("script");  scriptNode.type = "text/javascript";  scriptNode.id = id;  scriptNode.charset = charset    ? charset    : BROWSER.firefox    ? document.characterSet    : document.charset;  try {    if (src) {      scriptNode.src = src;      scriptNode.onloadDone = false;      scriptNode.onload = function() {        scriptNode.onloadDone = true;        JSLOADED[src] = 1;      };      scriptNode.onreadystatechange = function() {        if (          (scriptNode.readyState == "loaded" ||            scriptNode.readyState == "complete") &&          !scriptNode.onloadDone        ) {          scriptNode.onloadDone = true;          JSLOADED[src] = 1;        }      };    } else if (text) {      scriptNode.text = text;    }    document.getElementsByTagName("head")[0].appendChild(scriptNode);  } catch (e) {}}

返回顶部的通用方法

function backTop(btnId) {  var btn = document.getElementById(btnId);  var d = document.documentElement;  var b = document.body;  window.onscroll = set;  btn.style.display = "none";  btn.onclick = function() {    btn.style.display = "none";    window.onscroll = null;    this.timer = setInterval(function() {      d.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1);      b.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1);      if (d.scrollTop + b.scrollTop == 0)        clearInterval(btn.timer, (window.onscroll = set));    }, 10);  };  function set() {    btn.style.display = d.scrollTop + b.scrollTop > 100 ? "block" : "none";  }}backTop("goTop");

实现base64解码

function base64_decode(data) {  var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";  var o1,    o2,    o3,    h1,    h2,    h3,    h4,    bits,    i = 0,    ac = 0,    dec = "",    tmp_arr = [];  if (!data) {    return data;  }  data += "";  do {    h1 = b64.indexOf(data.charAt(i++));    h2 = b64.indexOf(data.charAt(i++));    h3 = b64.indexOf(data.charAt(i++));    h4 = b64.indexOf(data.charAt(i++));    bits = (h1 << 18) | (h2 << 12) | (h3 << 6) | h4;    o1 = (bits >> 16) & 0xff;    o2 = (bits >> 8) & 0xff;    o3 = bits & 0xff;    if (h3 == 64) {      tmp_arr[ac++] = String.fromCharCode(o1);    } else if (h4 == 64) {      tmp_arr[ac++] = String.fromCharCode(o1, o2);    } else {      tmp_arr[ac++] = String.fromCharCode(o1, o2, o3);    }  } while (i < data.length);  dec = tmp_arr.join("");  dec = utf8_decode(dec);  return dec;}

确认是否是键盘有效输入值

function checkKey(iKey) {  if (iKey == 32 || iKey == 229) {    return true;  } /*空格和异常*/  if (iKey > 47 && iKey < 58) {    return true;  } /*数字*/  if (iKey > 64 && iKey < 91) {    return true;  } /*字母*/  if (iKey > 95 && iKey < 108) {    return true;  } /*数字键盘1*/  if (iKey > 108 && iKey < 112) {    return true;  } /*数字键盘2*/  if (iKey > 185 && iKey < 193) {    return true;  } /*符号1*/  if (iKey > 218 && iKey < 223) {    return true;  } /*符号2*/  return false;}

全角半角转换

//iCase: 0全到半，1半到全，其他不转化function chgCase(sStr, iCase) {  if (    typeof sStr != "string" ||    sStr.length <= 0 ||    !(iCase === 0 || iCase == 1)  ) {    return sStr;  }  var i,    oRs = [],    iCode;  if (iCase) {    /*半->全*/    for (i = 0; i < sStr.length; i += 1) {      iCode = sStr.charCodeAt(i);      if (iCode == 32) {        iCode = 12288;      } else if (iCode < 127) {        iCode += 65248;      }      oRs.push(String.fromCharCode(iCode));    }  } else {    /*全->半*/    for (i = 0; i < sStr.length; i += 1) {      iCode = sStr.charCodeAt(i);      if (iCode == 12288) {        iCode = 32;      } else if (iCode > 65280 && iCode < 65375) {        iCode -= 65248;      }      oRs.push(String.fromCharCode(iCode));    }  }  return oRs.join("");}

版本对比

function compareVersion(v1, v2) {  v1 = v1.split(".");  v2 = v2.split(".");
  var len = Math.max(v1.length, v2.length);
  while (v1.length < len) {    v1.push("0");  }
  while (v2.length < len) {    v2.push("0");  }
  for (var i = 0; i < len; i++) {    var num1 = parseInt(v1[i]);    var num2 = parseInt(v2[i]);
    if (num1 > num2) {      return 1;    } else if (num1 < num2) {      return -1;    }  }  return 0;}

压缩CSS样式代码

function compressCss(s) {  //压缩代码  s = s.replace(/\/\*(.|\n)*?\*\//g, ""); //删除注释  s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1");  s = s.replace(/\,[\s\.\#\d]*\{/g, "{"); //容错处理  s = s.replace(/;\s*;/g, ";"); //清除连续分号  s = s.match(/^\s*(\S+(\s+\S+)*)\s*$/); //去掉首尾空白  return s == null ? "" : s[1];}

获取当前路径

var currentPageUrl = "";if (typeof this.href === "undefined") {  currentPageUrl = document.location.toString().toLowerCase();} else {  currentPageUrl = this.href.toString().toLowerCase();}

字符串长度截取

function cutstr(str, len) {    var temp,        icount = 0,        patrn = /[^\x00-\xff]/，        strre = "";    for (var i = 0; i < str.length; i++) {        if (icount < len - 1) {            temp = str.substr(i, 1);                if (patrn.exec(temp) == null) {                   icount = icount + 1            } else {                icount = icount + 2            }            strre += temp            } else {            break;        }    }    return strre + "..."}

时间日期格式转换

Date.prototype.format = function(formatStr) {  var str = formatStr;  var Week = ["日", "一", "二", "三", "四", "五", "六"];  str = str.replace(/yyyy|YYYY/, this.getFullYear());  str = str.replace(    /yy|YY/,    this.getYear() % 100 > 9      ? (this.getYear() % 100).toString()      : "0" + (this.getYear() % 100)  );  str = str.replace(    /MM/,    this.getMonth() + 1 > 9      ? (this.getMonth() + 1).toString()      : "0" + (this.getMonth() + 1)  );  str = str.replace(/M/g, this.getMonth() + 1);  str = str.replace(/w|W/g, Week[this.getDay()]);  str = str.replace(    /dd|DD/,    this.getDate() > 9 ? this.getDate().toString() : "0" + this.getDate()  );  str = str.replace(/d|D/g, this.getDate());  str = str.replace(    /hh|HH/,    this.getHours() > 9 ? this.getHours().toString() : "0" + this.getHours()  );  str = str.replace(/h|H/g, this.getHours());  str = str.replace(    /mm/,    this.getMinutes() > 9      ? this.getMinutes().toString()      : "0" + this.getMinutes()  );  str = str.replace(/m/g, this.getMinutes());  str = str.replace(    /ss|SS/,    this.getSeconds() > 9      ? this.getSeconds().toString()      : "0" + this.getSeconds()  );  str = str.replace(/s|S/g, this.getSeconds());  return str;};
// 或Date.prototype.format = function(format) {  var o = {    "M+": this.getMonth() + 1, //month    "d+": this.getDate(), //day    "h+": this.getHours(), //hour    "m+": this.getMinutes(), //minute    "s+": this.getSeconds(), //second    "q+": Math.floor((this.getMonth() + 3) / 3), //quarter    S: this.getMilliseconds() //millisecond  };  if (/(y+)/.test(format))    format = format.replace(      RegExp.$1,      (this.getFullYear() + "").substr(4 - RegExp.$1.length)    );  for (var k in o) {    if (new RegExp("(" + k + ")").test(format))      format = format.replace(        RegExp.$1,        RegExp.$1.length == 1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length)      );  }  return format;};alert(new Date().format("yyyy-MM-dd hh:mm:ss"));

跨浏览器删除事件

function delEvt(obj, evt, fn) {  if (!obj) {    return;  }  if (obj.addEventListener) {    obj.addEventListener(evt, fn, false);  } else if (oTarget.attachEvent) {    obj.attachEvent("on" + evt, fn);  } else {    obj["on" + evt] = fn;  }}

判断是否以某个字符串结束

String.prototype.endWith = function(s) {  var d = this.length - s.length;  return d >= 0 && this.lastIndexOf(s) == d;};

返回脚本内容

function evalscript(s) {  if (s.indexOf("<script") == -1) return s;  var p = /<script[^\>]*?>([^\x00]*?)<\/script>/gi;  var arr = [];  while ((arr = p.exec(s))) {    var p1 = /<script[^\>]*?src=\"([^\>]*?)\"[^\>]*?(reload=\"1\")?(?:charset=\"([\w\-]+?)\")?><\/script>/i;    var arr1 = [];    arr1 = p1.exec(arr[0]);    if (arr1) {      appendscript(arr1[1], "", arr1[2], arr1[3]);    } else {      p1 = /<script(.*?)>([^\x00]+?)<\/script>/i;      arr1 = p1.exec(arr[0]);      appendscript("", arr1[2], arr1[1].indexOf("reload=") != -1);    }  }  return s;}

格式化CSS样式代码

function formatCss(s) {  //格式化代码  s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1");  s = s.replace(/;\s*;/g, ";"); //清除连续分号  s = s.replace(/\,[\s\.\#\d]*{/g, "{");  s = s.replace(/([^\s])\{([^\s])/g, "$1 {\n\t$2");  s = s.replace(/([^\s])\}([^\n]*)/g, "$1\n}\n$2");  s = s.replace(/([^\s]);([^\s\}])/g, "$1;\n\t$2");  return s;}

获取cookie值

function getCookie(name) {  var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));  if (arr != null) return unescape(arr[2]);  return null;}

获得URL中GET参数值

// 用法：如果地址是 test.htm?t1=1&t2=2&t3=3, 那么能取得：GET["t1"], GET["t2"], GET["t3"]function getGet() {  querystr = window.location.href.split("?");  if (querystr[1]) {    GETs = querystr[1].split("&");    GET = [];    for (i = 0; i < GETs.length; i++) {      tmp_arr = GETs.split("=");      key = tmp_arr[0];      GET[key] = tmp_arr[1];    }  }  return querystr[1];}

获取移动设备初始化大小

function getInitZoom() {  if (!this._initZoom) {    var screenWidth = Math.min(screen.height, screen.width);    if (this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()) {      screenWidth = screenWidth / window.devicePixelRatio;    }    this._initZoom = screenWidth / document.body.offsetWidth;  }  return this._initZoom;}

获取页面高度

function getPageHeight() {  var g = document,    a = g.body,    f = g.documentElement,    d = g.compatMode == "BackCompat" ? a : g.documentElement;  return Math.max(f.scrollHeight, a.scrollHeight, d.clientHeight);}

获取页面scrollLeft

function getPageScrollLeft() {  var a = document;  return a.documentElement.scrollLeft || a.body.scrollLeft;}

获取页面scrollTop

function getPageScrollTop() {  var a = document;  return a.documentElement.scrollTop || a.body.scrollTop;}

获取页面可视高度

function getPageViewHeight() {  var d = document,    a = d.compatMode == "BackCompat" ? d.body : d.documentElement;  return a.clientHeight;}

获取页面可视宽度

function getPageViewWidth() {  var d = document,    a = d.compatMode == "BackCompat" ? d.body : d.documentElement;  return a.clientWidth;}

获取页面宽度

function getPageWidth() {  var g = document,    a = g.body,    f = g.documentElement,    d = g.compatMode == "BackCompat" ? a : g.documentElement;  return Math.max(f.scrollWidth, a.scrollWidth, d.clientWidth);}

获取移动设备屏幕宽度

function getScreenWidth() {  var smallerSide = Math.min(screen.width, screen.height);  var fixViewPortsExperiment =    rendererModel.runningExperiments.FixViewport ||    rendererModel.runningExperiments.fixviewport;  var fixViewPortsExperimentRunning =    fixViewPortsExperiment && fixViewPortsExperiment.toLowerCase() === "new";  if (fixViewPortsExperiment) {    if (this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()) {      smallerSide = smallerSide / window.devicePixelRatio;    }  }  return smallerSide;}

获取网页被卷去的位置

function getScrollXY() {  return document.body.scrollTop    ? {        x: document.body.scrollLeft,        y: document.body.scrollTop      }    : {        x: document.documentElement.scrollLeft,        y: document.documentElement.scrollTop      };}

获取URL上的参数

// 获取URL中的某参数值,不区分大小写// 获取URL中的某参数值,不区分大小写,// 默认是取'hash'里的参数，// 如果传其他参数支持取‘search’中的参数// @param {String} name 参数名称export function getUrlParam(name, type = "hash") {  let newName = name,    reg = new RegExp("(^|&)" + newName + "=([^&]*)(&|$)", "i"),    paramHash = window.location.hash.split("?")[1] || "",    paramSearch = window.location.search.split("?")[1] || "",    param;
  type === "hash" ? (param = paramHash) : (param = paramSearch);
  let result = param.match(reg);
  if (result != null) {    return result[2].split("/")[0];  }  return null;}

检验URL链接是否有效

function getUrlState(URL) {  var xmlhttp = new ActiveXObject("microsoft.xmlhttp");  xmlhttp.Open("GET", URL, false);  try {    xmlhttp.Send();  } catch (e) {  } finally {    var result = xmlhttp.responseText;    if (result) {      if (xmlhttp.Status == 200) {        return true;      } else {        return false;      }    } else {      return false;    }  }}

获取窗体可见范围的宽与高

function getViewSize() {  var de = document.documentElement;  var db = document.body;  var viewW = de.clientWidth == 0 ? db.clientWidth : de.clientWidth;  var viewH = de.clientHeight == 0 ? db.clientHeight : de.clientHeight;  return Array(viewW, viewH);}

获取移动设备最大化大小

function getZoom() {  var screenWidth =    Math.abs(window.orientation) === 90      ? Math.max(screen.height, screen.width)      : Math.min(screen.height, screen.width);  if (this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()) {    screenWidth = screenWidth / window.devicePixelRatio;  }  var FixViewPortsExperiment =    rendererModel.runningExperiments.FixViewport ||    rendererModel.runningExperiments.fixviewport;  var FixViewPortsExperimentRunning =    FixViewPortsExperiment &&    (FixViewPortsExperiment === "New" || FixViewPortsExperiment === "new");  if (FixViewPortsExperimentRunning) {    return screenWidth / window.innerWidth;  } else {    return screenWidth / document.body.offsetWidth;  }}

判断是否安卓移动设备访问

function isAndroidMobileDevice() {  return /android/i.test(navigator.userAgent.toLowerCase());}

判断是否苹果移动设备访问

function isAppleMobileDevice() {  return /iphone|ipod|ipad|Macintosh/i.test(navigator.userAgent.toLowerCase());}

判断是否为数字类型

function isDigit(value) {  var patrn = /^[0-9]*$/;  if (patrn.exec(value) == null || value == "") {    return false;  } else {    return true;  }}

是否是某类手机型号

// 用devicePixelRatio和分辨率判断const isIphonex = () => {  // X XS, XS Max, XR  const xSeriesConfig = [    {      devicePixelRatio: 3,      width: 375,      height: 812    },    {      devicePixelRatio: 3,      width: 414,      height: 896    },    {      devicePixelRatio: 2,      width: 414,      height: 896    }  ];  // h5  if (typeof window !== "undefined" && window) {    const isIOS = /iphone/gi.test(window.navigator.userAgent);    if (!isIOS) return false;    const { devicePixelRatio, screen } = window;    const { width, height } = screen;    return xSeriesConfig.some(      item =>        item.devicePixelRatio === devicePixelRatio &&        item.width === width &&        item.height === height    );  }  return false;};

判断是否移动设备

function isMobile() {  if (typeof this._isMobile === "boolean") {    return this._isMobile;  }  var screenWidth = this.getScreenWidth();  var fixViewPortsExperiment =    rendererModel.runningExperiments.FixViewport ||    rendererModel.runningExperiments.fixviewport;  var fixViewPortsExperimentRunning =    fixViewPortsExperiment && fixViewPortsExperiment.toLowerCase() === "new";  if (!fixViewPortsExperiment) {    if (!this.isAppleMobileDevice()) {      screenWidth = screenWidth / window.devicePixelRatio;    }  }  var isMobileScreenSize = screenWidth < 600;  var isMobileUserAgent = false;  this._isMobile = isMobileScreenSize && this.isTouchScreen();  return this._isMobile;}

判断是否手机号码

function isMobileNumber(e) {  var i =      "134,135,136,137,138,139,150,151,152,157,158,159,187,188,147,182,183,184,178",    n = "130,131,132,155,156,185,186,145,176",    a = "133,153,180,181,189,177,173,170",    o = e || "",    r = o.substring(0, 3),    d = o.substring(0, 4),    s =      !!/^1\d{10}$/.test(o) &&      (n.indexOf(r) >= 0        ? "联通"        : a.indexOf(r) >= 0        ? "电信"        : "1349" == d        ? "电信"        : i.indexOf(r) >= 0        ? "移动"        : "未知");  return s;}

判断是否是移动设备访问

function isMobileUserAgent() {  return /iphone|ipod|android.*mobile|windows.*phone|blackberry.*mobile/i.test(    window.navigator.userAgent.toLowerCase()  );}

判断鼠标是否移出事件

function isMouseOut(e, handler) {  if (e.type !== "mouseout") {    return false;  }  var reltg = e.relatedTarget    ? e.relatedTarget    : e.type === "mouseout"    ? e.toElement    : e.fromElement;  while (reltg && reltg !== handler) {    reltg = reltg.parentNode;  }  return reltg !== handler;}

判断是否Touch屏幕

function isTouchScreen() {  return (    "ontouchstart" in window ||    (window.DocumentTouch && document instanceof DocumentTouch)  );}

判断是否为网址

function isURL(strUrl) {  var regular = /^\b(((https?|ftp):\/\/)?[-a-z0-9]+(\.[-a-z0-9]+)*\.(?:com|edu|gov|int|mil|net|org|biz|info|name|museum|asia|coop|aero|[a-z][a-z]|((25[0-5])|(2[0-4]\d)|(1\d\d)|([1-9]\d)|\d))\b(\/[-a-z0-9_:\@&?=+,.!\/~%\$]*)?)$/i;  if (regular.test(strUrl)) {    return true;  } else {    return false;  }}

判断是否打开视窗

function isViewportOpen() {  return !!document.getElementById("wixMobileViewport");}

加载样式文件

function loadStyle(url) {  try {    document.createStyleSheet(url);  } catch (e) {    var cssLink = document.createElement("link");    cssLink.rel = "stylesheet";    cssLink.type = "text/css";    cssLink.href = url;    var head = document.getElementsByTagName("head")[0];    head.appendChild(cssLink);  }}

替换地址栏

function locationReplace(url) {  if (history.replaceState) {    history.replaceState(null, document.title, url);    history.go(0);  } else {    location.replace(url);  }}

解决offsetX兼容性问题

// 针对火狐不支持offsetX/Yfunction getOffset(e) {  var target = e.target, // 当前触发的目标对象    eventCoord,    pageCoord,    offsetCoord;
  // 计算当前触发元素到文档的距离  pageCoord = getPageCoord(target);
  // 计算光标到文档的距离  eventCoord = {    X: window.pageXOffset + e.clientX,    Y: window.pageYOffset + e.clientY  };
  // 相减获取光标到第一个定位的父元素的坐标  offsetCoord = {    X: eventCoord.X - pageCoord.X,    Y: eventCoord.Y - pageCoord.Y  };  return offsetCoord;}
function getPageCoord(element) {  var coord = { X: 0, Y: 0 };  // 计算从当前触发元素到根节点为止，  // 各级 offsetParent 元素的 offsetLeft 或 offsetTop 值之和  while (element) {    coord.X += element.offsetLeft;    coord.Y += element.offsetTop;    element = element.offsetParent;  }  return coord;}

打开一个窗体通用方法

function openWindow(url, windowName, width, height) {  var x = parseInt(screen.width / 2.0) - width / 2.0;  var y = parseInt(screen.height / 2.0) - height / 2.0;  var isMSIE = navigator.appName == "Microsoft Internet Explorer";  if (isMSIE) {    var p = "resizable=1,location=no,scrollbars=no,width=";    p = p + width;    p = p + ",height=";    p = p + height;    p = p + ",left=";    p = p + x;    p = p + ",top=";    p = p + y;    retval = window.open(url, windowName, p);  } else {    var win = window.open(      url,      "ZyiisPopup",      "top=" +        y +        ",left=" +        x +        ",scrollbars=" +        scrollbars +        ",dialog=yes,modal=yes,width=" +        width +        ",height=" +        height +        ",resizable=no"    );    eval("try { win.resizeTo(width, height); } catch(e) { }");    win.focus();  }  }

将键值对拼接成URL带参数

export default const fnParams2Url = obj=> {      let aUrl = []      let fnAdd = function(key, value) {        return key + '=' + value      }      for (var k in obj) {        aUrl.push(fnAdd(k, obj[k]))      }      return encodeURIComponent(aUrl.join('&')) }

去掉url前缀

function removeUrlPrefix(a) {  a = a    .replace(/：/g, ":")    .replace(/．/g, ".")    .replace(/／/g, "/");  while (    trim(a)      .toLowerCase()      .indexOf("http://") == 0  ) {    a = trim(a.replace(/http:\/\//i, ""));  }  return a;}

替换全部

String.prototype.replaceAll = function(s1, s2) {  return this.replace(new RegExp(s1, "gm"), s2);};

resize的操作

(function() {  var fn = function() {    var w = document.documentElement        ? document.documentElement.clientWidth        : document.body.clientWidth,      r = 1255,      b = Element.extend(document.body),      classname = b.className;    if (w < r) {      //当窗体的宽度小于1255的时候执行相应的操作    } else {      //当窗体的宽度大于1255的时候执行相应的操作    }  };  if (window.addEventListener) {    window.addEventListener("resize", function() {      fn();    });  } else if (window.attachEvent) {    window.attachEvent("onresize", function() {      fn();    });  }  fn();})();

滚动到顶部

// 使用document.documentElement.scrollTop 或 document.body.scrollTop 获取到顶部的距离，从顶部// 滚动一小部分距离。使用window.requestAnimationFrame()来滚动。// @example// scrollToTop();function scrollToTop() {  var c = document.documentElement.scrollTop || document.body.scrollTop;
  if (c > 0) {    window.requestAnimationFrame(scrollToTop);    window.scrollTo(0, c - c / 8);  }}

设置cookie值

function setCookie(name, value, Hours) {  var d = new Date();  var offset = 8;  var utc = d.getTime() + d.getTimezoneOffset() * 60000;  var nd = utc + 3600000 * offset;  var exp = new Date(nd);  exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000);  document.cookie =    name +    "=" +    escape(value) +    ";path=/;expires=" +    exp.toGMTString() +    ";domain=360doc.com;";}

设为首页

function setHomepage() {  if (document.all) {    document.body.style.behavior = "url(#default#homepage)";    document.body.setHomePage("http://w3cboy.com");  } else if (window.sidebar) {    if (window.netscape) {      try {        netscape.security.PrivilegeManager.enablePrivilege(          "UniversalXPConnect"        );      } catch (e) {        alert(          "该操作被浏览器拒绝，如果想启用该功能，请在地址栏内输入 about:config,然后将项 signed.applets.codebase_principal_support 值该为true"        );      }    }    var prefs = Components.classes[      "@mozilla.org/preferences-service;1"    ].getService(Components.interfaces.nsIPrefBranch);    prefs.setCharPref("browser.startup.homepage", "http://w3cboy.com");  }}

按字母排序，对每行进行数组排序

function setSort() {  var text = K1.value    .split(/[\r\n]/)    .sort()    .join("\r\n"); //顺序  var test = K1.value    .split(/[\r\n]/)    .sort()    .reverse()    .join("\r\n"); //反序  K1.value = K1.value != text ? text : test;}

延时执行

// 比如 sleep(1000) 意味着等待1000毫秒，还可从 Promise、Generator、Async/Await 等角度实现。// Promiseconst sleep = time => {  return new Promise(resolve => setTimeout(resolve, time));};
sleep(1000).then(() => {  console.log(1);});
 
// Generatorfunction* sleepGenerator(time) {  yield new Promise(function(resolve, reject) {    setTimeout(resolve, time);  });}
sleepGenerator(1000)  .next()  .value.then(() => {    console.log(1);  });
//asyncfunction sleep(time) {  return new Promise(resolve => setTimeout(resolve, time));}
async function output() {  let out = await sleep(1000);  console.log(1);  return out;}
output();
function sleep(callback, time) {  if (typeof callback === "function") {    setTimeout(callback, time);  }}
function output() {  console.log(1);}
sleep(output, 1000);

判断是否以某个字符串开头

String.prototype.startWith = function(s) {  return this.indexOf(s) == 0;};

清除脚本内容

function stripscript(s) {  return s.replace(/<script.*?>.*?<\/script>/gi, "");}

时间个性化输出功能

/*1、< 60s, 显示为“刚刚”2、>= 1min && < 60 min, 显示与当前时间差“XX分钟前”3、>= 60min && < 1day, 显示与当前时间差“今天 XX:XX”4、>= 1day && < 1year, 显示日期“XX月XX日 XX:XX”5、>= 1year, 显示具体日期“XXXX年XX月XX日 XX:XX”*/function timeFormat(time) {  var date = new Date(time),    curDate = new Date(),    year = date.getFullYear(),    month = date.getMonth() + 10,    day = date.getDate(),    hour = date.getHours(),    minute = date.getMinutes(),    curYear = curDate.getFullYear(),    curHour = curDate.getHours(),    timeStr;
  if (year < curYear) {    timeStr = year + "年" + month + "月" + day + "日 " + hour + ":" + minute;  } else {    var pastTime = curDate - date,      pastH = pastTime / 3600000;
    if (pastH > curHour) {      timeStr = month + "月" + day + "日 " + hour + ":" + minute;    } else if (pastH >= 1) {      timeStr = "今天 " + hour + ":" + minute + "分";    } else {      var pastM = curDate.getMinutes() - minute;      if (pastM > 1) {        timeStr = pastM + "分钟前";      } else {        timeStr = "刚刚";      }    }  }  return timeStr;}

全角转换为半角函数

function toCDB(str) {  var result = "";  for (var i = 0; i < str.length; i++) {    code = str.charCodeAt(i);    if (code >= 65281 && code <= 65374) {      result += String.fromCharCode(str.charCodeAt(i) - 65248);    } else if (code == 12288) {      result += String.fromCharCode(str.charCodeAt(i) - 12288 + 32);    } else {      result += str.charAt(i);    }  }  return result;}

半角转换为全角函数

function toDBC(str) {  var result = "";  for (var i = 0; i < str.length; i++) {    code = str.charCodeAt(i);    if (code >= 33 && code <= 126) {      result += String.fromCharCode(str.charCodeAt(i) + 65248);    } else if (code == 32) {      result += String.fromCharCode(str.charCodeAt(i) + 12288 - 32);    } else {      result += str.charAt(i);    }  }  return result;}

金额大写转换函数

function transform(tranvalue) {  try {    var i = 1;    var dw2 = new Array("", "万", "亿"); //大单位    var dw1 = new Array("拾", "佰", "仟"); //小单位    var dw = new Array(      "零",      "壹",      "贰",      "叁",      "肆",      "伍",      "陆",      "柒",      "捌",      "玖"    );    //整数部分用    //以下是小写转换成大写显示在合计大写的文本框中    //分离整数与小数    var source = splits(tranvalue);    var num = source[0];    var dig = source[1];    //转换整数部分    var k1 = 0; //计小单位    var k2 = 0; //计大单位    var sum = 0;    var str = "";    var len = source[0].length; //整数的长度    for (i = 1; i <= len; i++) {      var n = source[0].charAt(len - i); //取得某个位数上的数字      var bn = 0;      if (len - i - 1 >= 0) {        bn = source[0].charAt(len - i - 1); //取得某个位数前一位上的数字      }      sum = sum + Number(n);      if (sum != 0) {        str = dw[Number(n)].concat(str); //取得该数字对应的大写数字，并插入到str字符串的前面        if (n == "0") sum = 0;      }      if (len - i - 1 >= 0) {        //在数字范围内        if (k1 != 3) {          //加小单位          if (bn != 0) {            str = dw1[k1].concat(str);          }          k1++;        } else {          //不加小单位，加大单位          k1 = 0;          var temp = str.charAt(0);          if (temp == "万" || temp == "亿")            //若大单位前没有数字则舍去大单位            str = str.substr(1, str.length - 1);          str = dw2[k2].concat(str);          sum = 0;        }      }      if (k1 == 3) {        //小单位到千则大单位进一        k2++;      }    }    //转换小数部分    var strdig = "";    if (dig != "") {      var n = dig.charAt(0);      if (n != 0) {        strdig += dw[Number(n)] + "角"; //加数字      }      var n = dig.charAt(1);      if (n != 0) {        strdig += dw[Number(n)] + "分"; //加数字      }    }    str += "元" + strdig;  } catch (e) {    return "0元";  }  return str;}//拆分整数与小数function splits(tranvalue) {  var value = new Array("", "");  temp = tranvalue.split(".");  for (var i = 0; i < temp.length; i++) {    value = temp;  }  return value;}

清除空格

String.prototype.trim = function() {  var reExtraSpace = /^\s*(.*?)\s+$/;  return this.replace(reExtraSpace, "$1");};
// 清除左空格function ltrim(s) {  return s.replace(/^(\s*|　*)/, "");}
// 清除右空格function rtrim(s) {  return s.replace(/(\s*|　*)$/, "");}

随机数时间戳

function uniqueId() {  var a = Math.random,    b = parseInt;  return (    Number(new Date()).toString() + b(10 * a()) + b(10 * a()) + b(10 * a())  );}

实现utf8解码

function utf8_decode(str_data) {  var tmp_arr = [],    i = 0,    ac = 0,    c1 = 0,    c2 = 0,    c3 = 0;  str_data += "";  while (i < str_data.length) {    c1 = str_data.charCodeAt(i);    if (c1 < 128) {      tmp_arr[ac++] = String.fromCharCode(c1);      i++;    } else if (c1 > 191 && c1 < 224) {      c2 = str_data.charCodeAt(i + 1);      tmp_arr[ac++] = String.fromCharCode(((c1 & 31) << 6) | (c2 & 63));      i += 2;    } else {      c2 = str_data.charCodeAt(i + 1);      c3 = str_data.charCodeAt(i + 2);      tmp_arr[ac++] = String.fromCharCode(        ((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63)      );      i += 3;    }  }  return tmp_arr.join("");}

校验是否为一个数字，以及该数字小数点位数是否与参数floats一致

校验规则：

若参数floats有值，则校验该数字小数点后的位数。
若参数floats没有值，则仅仅校验是否为数字。

function isNum(value,floats=null){    let regexp = new RegExp(`^[1-9][0-9]*.[0-9]{${floats}}$|^0.[0-9]{${floats}}$`);    return typeof value === 'number' && floats?regexp.test(String(value)):true;}

function anysicIntLength(minLength,maxLength){    let result_str = '';    if(minLength){        switch(maxLength){            case undefined:                result_str = result_str.concat(`{${minLength-1}}`);                break;            case null:                result_str = result_str.concat(`{${minLength-1},}`);                break;            default:                result_str = result_str.concat(`{${minLength-1},${maxLength-1}}`);        }    }else{        result_str = result_str.concat('*');    }
    return result_str;}

校验是否为非零的正整数

function isInt(value,minLength=null,maxLength=undefined){    if(!isNum(value)) return false;
    let regexp = new RegExp(`^-?[1-9][0-9]${anysicIntLength(minLength,maxLength)}$`);    return regexp.test(value.toString());}

校验是否为非零的正整数

function isPInt(value,minLength=null,maxLength=undefined) {    if(!isNum(value)) return false;
    let regexp = new RegExp(`^[1-9][0-9]${anysicIntLength(minLength,maxLength)}$`);    return regexp.test(value.toString());}

校验是否为非零的负整数

function isNInt(value,minLength=null,maxLength=undefined){    if(!isNum(value)) return false;    let regexp = new RegExp(`^-[1-9][0-9]${anysicIntLength(minLength,maxLength)}$`);    return regexp.test(value.toString());}

校验整数是否在取值范围内

校验规则：

minInt为在取值范围中最小的整数
maxInt为在取值范围中最大的整数

function checkIntRange(value,minInt,maxInt=9007199254740991){    return Boolean(isInt(value) && (Boolean(minInt!=undefined && minInt!=null)?value>=minInt:true) && (value<=maxInt));}

校验是否为中国大陆手机号

function isTel(value) {    return /^1[3,4,5,6,7,8,9][0-9]{9}$/.test(value.toString());}

校验是否为中国大陆传真或固定电话号码

function isFax(str) {    return /^([0-9]{3,4})?[0-9]{7,8}$|^([0-9]{3,4}-)?[0-9]{7,8}$/.test(str);}

校验是否为邮箱地址

function isEmail(str) {    return /^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$/.test(str);}

校验是否为QQ号码

校验规则：

非0开头的5位-13位整数

function isQQ(value) {    return /^[1-9][0-9]{4,12}$/.test(value.toString());}

校验是否为网址

校验规则：

以https://、http://、ftp://、rtsp://、mms://开头、或者没有这些开头
可以没有www开头(或其他二级域名)，仅域名
网页地址中允许出现/%*?@&等其他允许的符号

function isURL(str) {    return /^(https:\/\/|http:\/\/|ftp:\/\/|rtsp:\/\/|mms:\/\/)?[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+[\/=\?%\-&_~`@[\]\':+!]*([^<>\"\"])*$/.test(str);}

校验是否为不含端口号的IP地址

校验规则：

IP格式为xxx.xxx.xxx.xxx，每一项数字取值范围为0-255
除0以外其他数字不能以0开头，比如02

function isIP(str) {    return /^((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])\.){3}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])$/.test(str);}

校验是否为IPv6地址

校验规则：

支持IPv6正常格式
支持IPv6压缩格式

function isIPv6(str){    return Boolean(str.match(/:/g)?str.match(/:/g).length<=7:false && /::/.test(str)?/^([\da-f]{1,4}(:|::)){1,6}[\da-f]{1,4}$/i.test(str):/^([\da-f]{1,4}:){7}[\da-f]{1,4}$/i.test(str));}

校验是否为中国大陆第二代居民身份证

校验规则：

共18位，最后一位可为X(大小写均可)
不能以0开头
出生年月日会进行校验：年份只能为18/19/2*开头，月份只能为01-12，日只能为01-31

function isIDCard(str){    return /^[1-9][0-9]{5}(18|19|(2[0-9]))[0-9]{2}((0[1-9])|(10|11|12))(([0-2][1-9])|10|20|30|31)[0-9]{3}[0-9Xx]$/.test(str);}

校验是否为中国大陆邮政编码

参数value为数字或字符串

校验规则：

共6位，且不能以0开头

function isPostCode(value){    return /^[1-9][0-9]{5}$/.test(value.toString());}

校验两个参数是否完全相同，包括类型

校验规则：

值相同，数据类型也相同

function same(firstValue,secondValue){    return firstValue===secondValue;}

校验字符的长度是否在规定的范围内

校验规则：

minInt为在取值范围中最小的长度
maxInt为在取值范围中最大的长度

function lengthRange(str,minLength,maxLength=9007199254740991) {    return Boolean(str.length >= minLength && str.length <= maxLength);}

校验字符是否以字母开头

校验规则：

必须以字母开头
开头的字母不区分大小写

function letterBegin(str){    return /^[A-z]/.test(str);}

校验字符是否为纯数字(整数)

校验规则：

字符全部为正整数(包含0)
可以以0开头

functionpureNum(str) {    return /^[0-9]*$/.test(str);}

function anysicPunctuation(str){    if(!str) return null;    let arr = str.split('').map(item => {        return item = '\\' + item;    });    return arr.join('|');}

function getPunctuation(str){    return anysicPunctuation(str) || '\\~|\\`|\\!|\\@|\\#|\\$|\\%|\\^|\\&|\\*|\\(|\\)|\\-|\\_|\\+|\\=|\\||\\\|\\[|\\]|\\{|\\}|\\;|\\:|\\"|\\\'|\\,|\\<|\\.|\\>|\\/|\\?';}

function getExcludePunctuation(str){    let regexp = new RegExp(`[${anysicPunctuation(str)}]`,'g');    return getPunctuation(' ~`!@#$%^&*()-_+=\[]{};:"\',<.>/?'.replace(regexp,''));}

返回字符串构成种类(字母，数字，标点符号)的数量

LIP缩写的由来：L(letter 字母) + I(uint 数字) + P(punctuation 标点符号)

参数punctuation的说明：

punctuation指可接受的标点符号集
若需自定义符号集，例如“仅包含中划线和下划线”，将参数设置为"-_"即可
若不传值或默认为null，则内部默认标点符号集为除空格外的其他英文标点符号：~`!@#$%^&*()-_+=[]{};:"',<.>/?

function getLIPTypes(str,punctuation=null){    let p_regexp = new RegExp('['+getPunctuation(punctuation)+']');    return /[A-z]/.test(str) + /[0-9]/.test(str) + p_regexp.test(str);}

校验字符串构成的种类数量是否大于或等于参数num的值。通常用来校验用户设置的密码复杂程度。

校验规则：

参数num为需要构成的种类(字母、数字、标点符号)，该值只能是1-3。
默认参数num的值为1，即表示：至少包含字母，数字，标点符号中的1种
若参数num的值为2，即表示：至少包含字母，数字，标点符号中的2种
若参数num的值为3，即表示：必须同时包含字母，数字，标点符号
参数punctuation指可接受的标点符号集，具体设定可参考getLIPTypes()方法中关于标点符号集的解释。

function pureLIP(str,num=1,punctuation=null){    let regexp = new RegExp(`[^A-z0-9|${getPunctuation(punctuation)}]`);    return Boolean(!regexp.test(str) && getLIPTypes(str,punctuation)>= num);}

清除所有空格

function clearSpaces(str){    return str.replace(/[ ]/g,'');}

清除所有中文字符(包括中文标点符号)

function clearCNChars(str){    return str.replace(/[\u4e00-\u9fa5]/g,'');}

清除所有中文字符及空格

function clearCNCharsAndSpaces(str){    return str.replace(/[\u4e00-\u9fa5 ]/g,'');}

除保留标点符号集以外，清除其他所有英文的标点符号(含空格)

全部英文标点符号为：~`!@#$%^&*()-_+=[]{};:"',<.>/?

参数excludePunctuation指需要保留的标点符号集，例如若传递的值为'_'，即表示清除_以外的其他所有英文标点符号。

function clearPunctuation(str,excludePunctuation=null){    let regexp = new RegExp(`[${getExcludePunctuation(excludePunctuation)}]`,'g');    return str.replace(regexp,'');}

校验是否包含空格

function haveSpace(str) {    return /[ ]/.test(str);}

校验是否包含中文字符(包括中文标点符号)

function haveCNChars(str){    return /[\u4e00-\u9fa5]/.test(str);}