<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>bianli</title>
</head>
<body>
<div class="box" id="box">
<div class="box1" id="box1">
<div class="box2" id="box2">
<ul class="box3" id="box3">
<li class="li1" id="li1">我是li1</li>
<p class="p1" id="p1">我是p标签</p>
<li class="li2" id="li2">我是li2</li>
<li class="li3" id="li3">我是li3</li>
<li class="li4" id="li4">我是li4</li>
<li class="li5" id="li5">我是li5</li>
<li class="li6" id="li6">我是li6</li>
<li class="li7" id="li7">我是li7
<ul></ul>
</li>
<li class="li8" id="li8">我是li8</li>
<li class="li9" id="li9">我是li9</li>
</ul>
</div>
</div>
</div>
<script src="../jquery/jquery-3.3.1.js"></script>
<script>
$(function(){
console.log($("li").map(function(index,domElement){
//将一种jQuery对象转化成另一种jQuery对象。
return this.id;
}));
console.log($("div").each(function(index,domElement){
//遍历所有元素,如果id=box不加title，否则加title=id
if(this.id==="box"){
return true;
}
else
{this.title=this.id;}
}));
})
</script>
</body>
</html>
结果如下：
