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CSS3 过渡效果触发时机的问题

2016-08-22 14:39 323 查看
像360deg过渡效果,做专题的同学应该是经常做的.

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>360deg过渡效果</title>
<style type="text/css">
div{
cursor:pointer;
width:100px;
height:40px;
background:#92B901;
font-size:14px;
opacity:0.5;
transition-property:width,height,background,font-size,opacity,transform;
transition-duration:1s,1s,1s,1s,1s,1s;
border-radius:5px;
font-weight:bold;
color:#FFF;
padding:10px;
}
div:hover{
width:120px;
height:60px;
background:#1ec7e6;
font-size:20px;
opacity:1;
transform:rotate(360deg);
}
</style>
</head>
<body>
<div>CSS3 transition</div>
</body>
</html>




其实触发过渡效果有很多种方式,今天总结一下:
1.最常见的hover触发过渡效果

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>hover过渡效果</title>
<style type="text/css">
div{cursor:pointer;width:100px;height:40px;background:#92b901;transition:width 0.5s;}
div:hover{width:200px;}
</style>
</head>
<body>
<div></div>
</body>
</html>


2.js添加操作来触发

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>js添加样式来触发过渡效果</title>
<style type="text/css">
div{width:100px;height:40px;background:#92b901;transition:width 0.5s;}
.change{width:200px;}
</style>
<script type="text/javascript">
setTimeout(function(){
var div = document.querySelector("div");
div.classList.add("change");
});
</script>
</head>
<body>
<div></div>
</body>
</html>


比如直接修改style属性来触发

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>js直接修改style属性来触发过渡效果</title>
<style type="text/css">
div{width:100px;height:40px;background:#92b901;transition:width 0.5s;}
</style>
<script type="text/javascript">
setTimeout(function(){
var div = document.querySelector("div");
div.style.width="200px";
});
</script>
</head>
<body>
<div></div>
</body>
</html>


3.通过伪类触发

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>js直接修改伪类属性来触发过渡效果</title>
<style type="text/css">
div{width:100px;height:40px;background:#92b901;transition:width 0.5s;}
input:focus ~ div{width:200px;}
</style>
</head>
<body>
<input>
<div></div>
</body>
</html>


利用input获得焦点,可以把一些相应提示信息显示出来

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>input获得焦点,可以把一些相应提示信息显示出来</title>
<style type="text/css">
input:focus ~ p{width:200px;transform:scale(1);}
p{transform:scale(0);transition:transform 0.2s;}
</style>
</head>
<body>
<input>
<p>请输入数字</p>
</body>
</html>


通过active来触发

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>active来触发</title>
<style type="text/css">
button:active ~ p{width:200px;transform:scale(1);}
p{transform:scale(0);transition:transform 0.2s;}
</style>
</head>
<body>
<button>hold me</button>
<p>hahah</p>
</body>
</html>


开关按钮

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
input{display:none;}
label{width:100px;height:50px;background:#ADC14E;display:block;border-radius:25px;}
div{width:50px;height:50px;border-radius:50%;background:#FFF;border:1px solid silver;position:relative;left:0;transition: left 0.5s;}
input:checked ~ div{left:50px;}
</style>
</head>
<body>
<label>
<input type="checkbox">
<div></div>
</label>
</body>
</html>




如果上面要模拟开关,需要把主要的样式都放在input的兄弟元素上.
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