代码演示:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <table id="myTable" border="2px" cellpadding="0" cellspacing="0"> <tr> <th>全选<input id="all" type="checkbox" onclick="myAll()"/></th> <th>序号</th> <th>名称</th> <th>单价</th> <th>数量</th> <th>总计</th> </tr> <tr> <td><input name="one" type="checkbox" onclick="myOne()"/></td> <td>1</td> <td>小熊饼干</td> <td>125</td> <td>1</td> <td>125</td> </tr> <tr> <td><input name="one" type="checkbox" onclick="myOne()"/></td> <td>2</td> <td>小熊饼干</td> <td>125</td> <td>1</td> <td>125</td> </tr> <tr> <td><input name="one" type="checkbox" onclick="myOne()"/></td> <td>3</td> <td>小熊饼干</td> <td>125</td> <td>1</td> <td>125</td> </tr> </table> </body> </html> <script> function myAll(){ var all = document.getElementById("all"); var one = document.getElementsByName("one"); for(var i = 0;i<one.length;i++){ one[i].checked=all.checked; } } function myOne(){ var all = document.getElementById("all"); var one = document.getElementsByName("one"); for(var i = 0;i<one.length;i++){ if(one[i].checked==false){ all.checked=false; return false; } } all.checked=true; } </script>
代码演示:
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title></title> </head> <body> <div id="today01"> div----显示时间1 </div> <br /> <a href="javascript:window.clearInterval(flag01)">停止定时器clearInterval</a> <div id="today02"> div----显示时间2 </div> <a href="javascript:window.clearTimeout(flag02)">停止定时器clearTimeout</a> </body> </html> <script> function showTime01(){ var time = new Date(); var year = time.getFullYear(); var month = time .getMonth(); var day = time.getDate(); var hour = time.getHours(); var minte = time.getMinutes() var minlls = time.getSeconds(); document.getElementById("today01").innerHTML=year+"年"+month+"月"+day+"日"+hour+"时"+minte+"分"+minlls+"秒"; } //调用定时器 var flag01 = window.setInterval("showTime01()",1000); </script> <script> function showTime02(){ var time = new Date(); var Y = time.getFullYear(); var M = time.getMonth(); var D = time.getDate(); var H = time.getHours(); var M = time.getMinutes(); var S = time.getSeconds(); document.getElementById("today02").innerHTML=Y+"年"+M+"月"+D+"日"+H+"时"+M+"分"+S+"秒"; } var flag02 = window.setInterval("showTime02()",2000); </script>
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <button type="button" onclick="bianli()">遍历表格</button> <button type="button" onclick="addRow()">添加</button> <table id="myTable" border="2px" cellpadding="0" cellspacing="0" width="90%" style="text-align: center;"> <tr> <th>序号</th> <th>名称</th> <th>单价</th> <th>数量</th> <th>总计</th> </tr> <tr> <td>1</td> <td>小熊饼干</td> <td>125</td> <td>1</td> <td><button type="button" onclick="delRow(this)">删除</button></td> </tr> <tr> <td>2</td> <td>小熊饼干</td> <td>125</td> <td>1</td> <td><button type="button" onclick="delRow(this)">删除</button></td> </tr> <tr> <td>3</td> <td>小熊饼干</td> <td>125</td> <td>1</td> <td><button type="button" onclick="delRow(this)">删除</button></td> </tr> </table> </body> </html> <script> function bianli() { var tab = document.getElementById("myTable"); //获取到了表格的js对象 //获取表格的所有行 var trArr=tab.rows; //遍历行 for(var i=0;i<trArr.length;i++){ var trObj=trArr[i]; //alert("行的下标索引:"+trObj.rowIndex); //获取每行的单元格的集合 var tdArr=trObj.cells; //遍历每个单元格 var str=""; for(var j=0;j<tdArr.length;j++){ var tdObj=tdArr[j]; var html=tdObj.innerHTML;//获取每个单元格中的内容 var index=tdObj.cellIndex;//获取每个单元格的下标索引 str+=index+"-"+html+"====="; } console.log("行的下标索引:"+trObj.rowIndex+":"+str); } } function addRow(){ //获取到表格的对象 var tab=document.getElementById("myTable"); //给表格添加一行 var newTr=tab.insertRow(); //创建了一个空行,在页面上看不出来 //给新创建的行添加列 var newTd1=newTr.insertCell(); //给新的行创建了一个新的单元格 var newTd2=newTr.insertCell(); var newTd3=newTr.insertCell(); var newTd4=newTr.insertCell(); var newTd5=newTr.insertCell(); //给每一个单元格中添加内容 var num=parseInt(Math.random()*10)+1; newTd1.innerHTML=num; newTd2.innerHTML="小熊饼干"+num; newTd3.innerHTML="$125"; newTd4.innerHTML="1"; newTd5.innerHTML='<button type="button" onclick="delRow(this)"> 删除</button>'; } function delRow(btn){ var tab=document.getElementById("myTable"); //btn:表示点击的当前的删除按钮, //btn.parentNode获取的按钮的父元素td, //btn.parentNode.parentNode获取的 按钮的父元素td的父元素tr var trIndex=btn.parentNode.parentNode.rowIndex; //根据行的下标索引删除行 tab.deleteRow(trIndex); } </script>
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <select onchange="changeCity(this.value)"> <option>--请选择省份--</option> <option value="0">北京</option> <option value="1">浙江省</option> <option value="2">河北省</option> <option value="3">广东省</option> </select> <select id="city"> </select> </body> </html> <script> //创建二维数组存储省份和对应的城市 var cityList = new Array(); cityList[0] = new Array("朝阳区", "海淀区", "东城区", "西城区"); cityList[1] = new Array("杭州市", "嘉兴市", "宁波市", "绍兴市"); cityList[2] = new Array("石家庄市", "唐山市", "承德市", "张家口市"); cityList[3] = new Array("广州市", "惠州市", "深圳市", "茂名市"); function changeCity(val){ //获取到城市的下拉列表框 var city=document.getElementById("city"); //先去清空原有的城市下拉列表内容 city.options.length=0; var arr=cityList[val]; for(var i=0;i<arr.length;i++){ //创建option元素节点 var option=document.createElement("option"); //设置option元素节点的内容和value option.innerHTML=arr[i]; option.value=arr[i]; //将新创建的option节点添加到城市下拉框中 city.appendChild(option); } } </script>