<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1,maximum-scale=1,user-scalable=no">
<title>test</title>
<script src="https://cdn.bootcss.com/jquery/2.1.4/jquery.min.js"></script>
<style>
body {
background-color:#808080;
}
.main {
width: 300px;
height: 300px;
margin: 20% auto;
background: red; /*IE10式IE10+*/
}
</style>
</head>
<body>
<div class="main">
</div>
<script>
var num = 1;
var test = function () {
num++;
$(".main").css('background', 'linear-gradient(rgba(0,0,0,0) '+num+'%,red)');
if (num < 100) {
setTimeout(test, 100);
}
}
$(function () {
setTimeout(test, 100);
})
</script>
</body>
</html>效果为从上到下不断隐藏