Java教程

Javascript实战——电子钟（时钟、闹钟、计时器、倒计时）

本文主要是介绍Javascript实战——电子钟（时钟、闹钟、计时器、倒计时），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！

1.效果图

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2.源代码

<!DOCTYPE html>

<head>
    <meta charset="utf-8">
    <title>电子钟</title>
    <link rel="stylesheet" href="index.css">
</head>

<body>
    <div id="bigbox">
        <!-- 时钟 -->
        <div id="s1" class="smallbox">
            <h1>北京时间</h1>
            <h1 id="s1_h1_one"></h1>
            <h1 id="s1_h1_tow"></h1>
        </div>

        <!-- 闹钟 -->
        <div id="s2" class="smallbox">
            <h2>闹钟</h2>
            <input type="number" class="val" placeholder="时">
            <input type="number" class="val" placeholder="分">
            <input type="button" id="s2_add" value="添加">
        </div>

        <!-- 计时器 -->
        <div id="s3" class="smallbox">
            <p id="s3_p">0:0:0</p>
            <input type="button" id="s3_btn_one" value="开始">
            <input type="button" id="s3_btn_two" value="暂停">
            <input type="button" id="s3_btn_three" value="继续">
            <input type="button" id="s3_btn_four" value="结束">
            <!--<input type="button" id="s3_btn_five" value="记录">-->
        </div>

        <!-- 倒计时 -->
        <div id="s4" class="smallbox">
            <h2>倒计时</h2>
            <input type="text" id="s4_hour"  placeholder="时">
            <input type="text" id="s4_minute" placeholder="分">
            <input type="text" id="s4_second" placeholder="秒">
            <input type="button" id="s4_down" value="开始">
            <p id="s4_p">0</p>
        </div>
    </div>
    <script src="index.js"></script>
</body>

#bigbox {
    width: 80%;
    height: 500px;
    margin-left: 10%;
    margin-top: 100px;
}

.smallbox {
    width: 45%;
    height: 50%;
    background-color: blanchedalmond;
    border: 5px solid rgb(238, 159, 12);
    box-sizing: border-box;
    border-radius: 10%;
    text-align: center;
}

#s1 {
    float: left;
}

#s3 {
    float: left;
    margin-top: 5%;
}

#s2 {
    float: right;
}

#s4 {
    float: right;
    margin-top: 5%;
}

#s3_btn_two,
#s3_btn_three,
#s3_btn_four {
    display: none;
}

input {
    width: 60px;
    height: 40px;
    border: palevioletred;
    text-align: center;
    font-size: 20px;
}

p {
    font-size: 2em;
}

//获取元素结点
var s1 = document.getElementById("s1");
var s2 = document.getElementById("s2");
var s3 = document.getElementById("s3");
var s4 = document.getElementById("s4");
var s1_h1_one = document.getElementById("s1_h1_one");
var s1_h1_tow = document.getElementById("s1_h1_tow");

//时钟函数
function clock() {
    var datetime = new Date();
    var year = datetime.getFullYear();
    var month = datetime.getMonth();
    var date = datetime.getDate();
    var hour = datetime.getHours();
    var minute = datetime.getMinutes();
    var second = datetime.getSeconds();
    s1_h1_one.innerText = year + "年" + (month + 1) + "月" + date + "日";
    s1_h1_tow.innerText = hour + ':' + minute + ':' + second;
}

//初始化时钟
setTimeout(clock, 0);

//重复执行时钟函数
setInterval(clock, 1000);

//闹钟相关节点获取
var val = document.getElementsByClassName("val");
var s2_add = document.getElementById("s2_add");
console.log(val);

//闹钟相关数据定义
var arr_h = new Array();
var arr_m = [];
var num = 0;
var flag = 0;

//添加闹钟
s2_add.onclick = function add() {
    if (val[0].value < 0 || val[0].value > 23 || val[1].value < 0 || val[1].value > 59) {
        alert("输入错误,无法添加");
        for (var i = 0; i < 2; i++) {
            val[i].value = null;
        }
    } else {
        arr_h[num] = val[0].value;
        arr_m[num] = val[1].value;
        var s = "闹钟" + (num + 1) + ":" + arr_h[num] + ":" + arr_m[num];
        var textNode = document.createTextNode(s);
        var p = document.createElement("p");
        p.appendChild(textNode);
        s2.appendChild(p);
        num++;
        for (var i = 0; i < 2; i++) {
            val[i].value = null;
        }
    }
}

//删除闹钟
//大家先试着自己实现，讲解时再统一实现

//闹钟监视函数
function monitor() {
    var nowTime = new Date();
    var minute = nowTime.getMinutes();
    var hour = nowTime.getHours();
    for (var i = 0; i <= num; i++) {
        if (arr_m[i] == minute && arr_h == hour && flag == 0) {
            alert("闹钟响了");
            flag = 1;
        }
    }
}

//闹钟启动函数
setInterval(monitor, 1000);
setInterval(() => {
    flag == 0;
}, 60000);

//计时器相关元素结点获取
var s3_p = document.getElementById("s3_p");
var s3_btn_one = document.getElementById("s3_btn_one");
var s3_btn_two = document.getElementById("s3_btn_two");
var s3_btn_three = document.getElementById("s3_btn_three");
var s3_btn_four = document.getElementById("s3_btn_four");

var timer1, timer2;
var i = 0;

//计时器启动函数
s3_btn_one.onclick = function start() {
    clearInterval(timer1);
    timer1 = setInterval(count, 1000);
    s3_btn_one.style.display = "none";
    s3_btn_two.style.display = "inline-block";
    s3_btn_four.style.display = "inline-block";
}

//计时函数
function count() {
    i++;
    var second = parseInt(i % 60);
    var minute = parseInt(i / 60);
    var hour = parseInt(i / 60 / 60);
    s3_p.innerText = hour + ":" + minute + ":" + second;
}

//计时器暂停函数
s3_btn_two.onclick = function suspended() {
    clearInterval(timer1);
    s3_btn_two.style.display = "none";
    s3_btn_three.style.display = "inline-block";
}

//计时器继续函数
s3_btn_three.onclick = function keep() {
    clearInterval(timer1);
    timer1 = setInterval(count, 1000);
    s3_btn_two.style.display = "inline-block";
    s3_btn_three.style.display = "none";
}

//计时器清零函数
s3_btn_four.onclick = function cls() {
    clearInterval(timer1);
    clearInterval(timer2);
    i = 0;
    s3_p.innerText = "0:0:0";
    s3_btn_one.style.display = "inline-block";
    s3_btn_two.style.display = "none";
    s3_btn_three.style.display = "none";
    s3_btn_four.style.display = "none";
}

//计时器记录函数
//大家先试着自己实现，讲解时再统一实现


//获取倒计时相关节点
var s4_hour = document.getElementById("s4_hour");
var s4_minute = document.getElementById("s4_minute");
var s4_second = document.getElementById("s4_second");
var s4_down = document.getElementById("s4_down");
var s4_p = document.getElementById("s4_p");

//定义倒计时相关参数
var sum = 0;
var timer3;


//倒计时函数
s4_down.onclick = function down() {
    sum = parseInt(s4_hour.value * 60 * 60) + parseInt(s4_minute.value * 60) + parseInt(s4_second.value);
    s4_hour.value = null;
    s4_minute.value = null;
    s4_second.value = null;
    clearInterval(timer3);

    //ES6内容
    timer3 = setInterval(() => {
        s4_p.innerText = "剩余"+sum+"秒";
        if (sum == 0) {
            s4_p.innerText = "时间到了";
            clearInterval(timer3);
        }
        sum--;
    }, 1000);
}
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