<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script>
function hide(){
var a=document.getElementById("img")
img.style.display="none"
}
function show(){
var a=document.getElementById("img")
img.style.display="block"
setTimeout("hide()",3000)
}
function init(){
setTimeout("show()",3000)
}
</script>
</head>
<body onload="init()">
<img id="img" src="img/4.jpg" width="70%" style="display: none;"/>
</body>
</html>
图片自己弄
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