js里的li为什么获取不了
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<style type="text/css">
*{margin:0; padding:0;}
#banner{width:730px; height:454px; margin:20px auto;position:relative; }
#pic{width:730px; height:454px;}
#pic img{position:absolute; top:0; left:0; display:none;}
#left,#right{width:30px; height:40px; position:absolute; top:50%; margin-top:-20px;}
#left{left:0px;}
#right{right:0px;}
#tab{width:160px; height:20px; position:absolute; left:50%; margin-left:-78px; bottom:10px;}
#tab ul li{width:20px; height:20px; background:#bbb; color:#fff; text-align:center; line-height:20px; border-radius:100%; font-size:12px; font-family:"Microsoft yahei"; list-style:none; float:left; margin:0 3px; cursor:pointer;}
#tab ul li.on{background:#f60;}
</style>
<title>定时轮播</title>
</head>
<body>
<div id="banner">
<div id="pic">
<img src="img/1.jpg" alt="" />
<img src="img/2.jpg" alt="" />
<img src="img/3.jpg" alt="" />
<img src="img/4.jpg" alt="" />
<img src="img/5.jpg" alt="" />
<img src="img/6.jpg" alt="" />
</div>
<div id="btn">
<button id="left"><</button>
<button id="right">></button>
</div>
<div id="tab">
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
</ul>
</div>
</div>
<script type="text/javascript">
var aImg=document.getElementById("pic").getElementsByTagName("img");
var aTabli=document.getElementById("tab").getElementsByTagName("li");
aImg[0].style.display="block";
aTabli[3].className="on";
for(var i=0;i<aTabli.length;i++;){
aTabli[i].onclick=function(){
for(var j=0;j<aTabli.length;j++;){
aTabli[j].className="";
}
this.className="on";
};
}
</script>
</body>
</html>
qq_明_92回答
-
李晓健
//下面一行括号最后多一个分号 for(var i=0;i<aTabli.length;i++){ aTabli[i].onclick=function(){ //下面一行括号最后多一个分号 for(var j=0;j<aTabli.length;j++){ console.log(aTabli[j]); aTabli[j].className=""; } this.className="on"; }; }多了两个分号，所有就是语法错误，代码没有执行。 -
waithp
语法问题 。 i++ j++ 后面不需要分号。想这种问题打开console 就看到错误
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相关分类
JavaScript