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querySelectorAll.html
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<!DOCTYPE html>
<html>
<head>
<title>querySelectorAll</title>
<meta charset="utf-8">
<style type="text/css">
.meng{
color: red;
}
</style>
</head>
<body>
<div id="all" class="all">
<i>梦龙小站</i>
<p class="box">
<em class="span">梦龙小站</em>
</p>
<i class="span">梦龙小站</i>
<p class="box">
<em>梦龙小站</em>
<em>梦龙小站</em>
<em>梦龙小站</em>
<em>梦龙小站</em>
<em>梦龙小站</em>
<em>梦龙小站</em>
</p>
</div>
<script type="text/javascript">
//获取类名为all的<div>中所有的<i>元素，类似于getElementsByTagName("i")
var i = document.getElementById("all").querySelectorAll("i");
//获取类名为span的所有元素
var span = document.querySelectorAll(".span");
//获取所有<p>标签中的所有<em>元素
var em = document.querySelectorAll("p em");
var i, len, emOne;
for(i=0, len = em.length; i<len; i++){
emOne = em[i];
//或者 em.item(i);
emOne.className = "meng";
}
console.log(i);
console.log(span);
console.log(em);
</script>
</body>
</html>