JS---Math.Random()*10--[0,10)随机变颜色 

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>随机显示颜色</title>
    <style>
        #div1{
            width: 100px;
            height: 100px;
        }
    </style>
</head>
<body onload="change()">
<div id="div1"></div>

</body>
<script>
    function change(){
        var i=Math.random()*10;
        var div1=document.getElementById("div1");
        if(0<i<4){
            div1.style.backgroundColor="red";
        }
        if(4<=i&&i<7){
            div1.style.backgroundColor="yellow";
        }
        if(7<=i&&i<10){
            div1.style.backgroundColor="green";
        }
    }
</script>
</html>

 

posted @ 2017-09-24 16:51  Andy&  阅读(1377)  评论(0)    收藏  举报