<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>闭包</title>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
$(function(){
$('#test li').click(function(){
var index=$('#test li').index($(this));
alert(index);
})
})
</script>
</head>
<body>
<ul id='test'>
<li>这是第一条</li>
<li>这是第二条</li>
<li>这是第三条</li>
</ul>
</body>
</html>
利用闭包,代码简洁但增加了内存消耗
var ele=$('#test');
var liNode=ele.find('li');
var len=liNode.length;
for(var i=0;i<=len-1;i++){
liNode[i].onclick=(function(x){
return function(){
console.log(x);
//return x;
}
})(i)
}
增加自定义属性,改变了html代码
var ele=$('#test');
var liNode=ele.find('li');
var len=ele.find('li').length;
for(var i=0;i<=len-1;i++){
ele.find('li').eq(i).attr('index',i);
ele.find('li').eq(i).click(function(){
alert($(this).attr('index'));
})
}
转载于:https://www.cnblogs.com/positive/p/3596599.html