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用j s编写红绿灯

2022-07-21 05:23:00 【来康二锅头】 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
    <style>
        ul{
            width: 400px;
            height: 300px;
            margin: 60px auto;
        }
        li{
            display: block;
            border-radius: 50%;
            width: 100px;
            height: 100px;
            margin-left: 10px;
            float: left;
            background-color:black;
            text-align: center;
            line-height: 80px;
            font-size: 40px;
        }
        #time{
            width: 80px;
            height: 80px;
            margin-left: 20px;
            background-color:white;
            float: left;
            font-size: 60px;
            color: rgb(248, 15, 15);
            text-align: center;
            line-height: 80px;
        }
    </style>
</head>
<body>
    <div class="main">
        <ul><li id="red">红</li>
            <li id="yellow">黄</li>
            <li id="green">绿</li>
            <div id="time"></div>
        </ul>
        </div>
    </div>
</body>
<script>
    var now=5;

    var flag=1;             
    function fun(){
        /* document.getElementById("red").innerHTML=now--; */
  /*       console.log(now); */

    if(flag==1){
            if(now>=0)
                document.getElementById("red").style.backgroundColor="red";
            else{
                now=3;
                flag=2;
                document.getElementById("red").style.backgroundColor="black"
            }
            document.getElementById("red").innerHTML=now--;
        }
    if(flag==2){
        if(now>=0)
            document.getElementById("yellow").style.backgroundColor="yellow";
            else{
                now=3;
                flag=3;
                document.getElementById("yellow").style.backgroundColor="black"
            }
            document.getElementById("yellow").innerHTML=now--;
    }
    if(flag==3){
        if(now>=0)
            document.getElementById("green").style.backgroundColor="green";
            else{
                now=3;
                flag=1;
                document.getElementById("green").style.backgroundColor="black"
/*                 document.getElementById("red").style.backgroundColor="red";  */
                  

            }
            document.getElementById("green").innerHTML=now--;  
    }
    }
    fun();
    setInterval(fun,1000);
</script>
</html>

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版权声明
本文为[来康二锅头]所创，转载请带上原文链接，感谢
https://blog.csdn.net/qq_61854038/article/details/125879956

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