代码呢
1 回答
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>顶部广告展开收起</title>
<style>
body, div, img, span {
margin: 0;
padding: 0;
}
#content {
width: 960px;
height: 1000px;
background: #ccc;
margin: 0 auto;
}
#ad {
width: 960px;
margin: 0 auto;
display: none;
position: relative;
overflow: hidden;
}
#close {
position: absolute;
width: 20px;
height: 20px;
text-align: center;
line-height: 20px;
background: #CF3;
top: 0;
right: 0;
display: none;
cursor: pointer;
}
</style>
</head>
<body>
<div id="ad">
<img id="adcon" src="ad.png" width="960" height="386"/>
<img id="adcur" src="cur.png" width="960" height="68"/>
<span id="close">X</span>
</div>
<div id="content"><img src="数字商品-10-23.jpg" /></div>
<script>
//全局变量
/*var oAd = document.getElementById('ad');
var oAdcon = document.getElementById('adcon');
var oAdcur = document.getElementById('adcur');
var oClose = document.getElementById('close');
*/
var getId = function(id){
return document.getElementById(id);
}
var maxH = getId('adcon').height;//最大高度
var minH = getId('adcur').height;//最小高度
var step = 5;//移动的距离
var h = 0;
/*广告向下展开*/
function adDown(){
if(h<maxH){
h += step;//向下移动
setTimeout(adDown,1);
}else{
setTimeout(adUp,3000); //停留时间自己适当调整 1000 = 1秒
}
getId('ad').style.display = "block";
getId('ad').style.height = h+"px";
}
/*广告向上收起*/
function adUp(){
getId('ad').style.height = h+"px";
if(h>minH) {
h -= step;
setTimeout(adUp,1);
}else {
getId('adcon').style.display = "none";
getId('close').style.display = "block";
}
}
getId('close').onclick = function(){
getId('ad').style.display = "none";
}
setTimeout(adDown, 3000);
</script>
</body>
</html>
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