getElementsByTagName("div")和$("div")区别
作者:zccst
<body>
<div class="selected">1</div>
<div class="selected">1</div>
<div class="selected">1</div>
</body>
作者:zccst
<body>
<div class="selected">1</div>
<div class="selected">1</div>
<div class="selected">1</div>
</body>