setTimeout
setTimeout(函数，毫秒)；只执行一次
clearTimeout();清除，不会执行
例子：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
#guanggao{
display: none;
width: 300px;
height: 200px;
background: yellowgreen;
position: fixed;
bottom: 0;
right: 0;
}
</style>
</head>
<body>
<div id="guanggao"></div>
<script>
window.onload = function(){
var oGuangGao = document.getElementById('guanggao');
setTimeout(function(){
oGuangGao.style.display = 'block';
setTimeout(function(){
oGuangGao.style.display = 'none';
}, 5000);
}, 2000);
}
</script>
</body>
</html>
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