可视区颜色改变 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <title>Document</title>
</head>
<body>
</body>
</html>
<script>
    function client()
    {
        if(window.innerWidth!=null){
            return {
                width:window.innerWidth,
                height:window.innerHeight
            }
        }
        else if(document.compatMode==="CSS1Compat"){
            return{
                width:document.documentElement.clientWidth,
                height:document.documentElement.clientHeight
            }
        }
        else{
            return{
                width:document.body.clientWidth,
                height:document.body.clientHeight
            }
        }
    }
    reSize();//页面一加载先调用函数一次
    window.onresize = reSize; //不带括号，只要屏幕触发，就调用reSize函数
    function reSize(){
         var width=client().width;
            if(width>960)
            {
                document.body.style.backgroundColor = "red";
            }
            else if(width>640)
            {
                document. body.style.backgroundColor="green";
            }
            else{
                document.body.style.backgroundColor="blue";
            }

    }
</script>

　　

posted @ 2019-07-26 21:02  shanlu  阅读(117)  评论(0)    收藏  举报