伪类
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style type="text/css">
*{padding: 0px;margin: 0px;}
#div1
{
width: 200px;height: 200px;background: red;position: absolute;left: 50%;top: 50%;margin: -100px 0 0 -100px;box-shadow: 0 -100px 0 pink;
}
#div1:after
{
width: 100%;height: 100%;background: black;position: absolute;left: -100%;content: "666";box-shadow: 0 200px 0 yellow;color: white;
}
#div1:before
{
width: 100%;height: 100%;background: green;position: absolute;left: 100%;content: "777";box-shadow: 0 200px 0 blue;color: white;
}
</style>
</head>
<body>
<div id="div1"></div>
<script type="text/javascript">
function getStyle(obj,style)
{
if(obj.currentStyle)
{
return obj.currentStyle[style];
}
else
{
return getComputedStyle(obj)[style];
}
}
console.log(getComputedStyle(div1,":after")['width']);
var json={"height":"200px"}
alert(json["height"]);
//alert(div1.currentStyle.height);//ie系列低的浏览器用
alert(getComputedStyle(div1)["height"]);//都兼容
</script>
</body>
</html><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<video id="video"></video>
<script type="text/javascript">
video.src="http://images.sohu.com/ytv/SH/Coke/64036020120714021103.mp4?t="+Math.random();
video.addEventListener("progress",function()
{
console.log(video.buffered.end(0));//缓冲
});
</script>
</body>
</html><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style type="text/css">
*{margin: 0;padding: 0;list-style: none;}
div{width: 200px;height: 200px;background: black;position: absolute;left: 50%;top: 50%;margin: -100px 0 0 -100px;
transition:0.5s;
}
</style>
</head>
<body>
<div id="div1"></div>
<script type="text/javascript">
div1.onclick=function()
{
this.style.transform="rotate(90deg)";
}
div1.addEventListener("transitionend",function()
{
if(div1.style.background=="red")
{
div1.style.transform="rotate(0deg)";
div1.style.background="black";
}
else
{
div1.style.background="red";
}
});
</script>
</body>
</html><!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<script type="text/javascript">
setInterval = alert;
setInterval(1)
//可以简写为:
setInterval(function()
{
alert(1);
},这里是系统默认的事件);
</script>
</body>
</html><!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
*{margin: 0;padding: 0;}
#div1{width: 200px;height: 200px;background: black;}
#div1:after{
width: 314px;height: 200px;
background: red;
content: '';
position: absolute;
left: 200px;
}
#div2{height: 200px;background: green;}
</style>
</head>
<body>
<div id='div1'></div>
<script type="text/javascript">
/*
function getStyle(obj,style){
if(obj.currentStyle){//ie
return obj.currentStyle[style];
}
else{//非ie
return getComputedStyle(obj)[style]
}
}
*/
console.log(getComputedStyle(div1,':after')['width']);
/*
var json = {
'height':'200px'
}
*/
//alert(json['height']);
//alert(div1.currentStyle.height)
// alert(getComputedStyle(div1)['height'])
</script>
</body>
</html>本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。
原始发表：2020/10/02 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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