insert

English [?n?s?:rt]

vt. ??; ??(?? ????) ??; ?? ??? ??? ?? ???); ?? ??

before

英[b??f?r,-?for]

prep.before; ?...

conj....; ??...

adv.

jquery insertBefore() ??? ???

??: insertBefore() ???? ??? ?? ?? HTML ??? ?? ??? ?????. ? ??? ?? ??? ???? ??? ?? ???? ???? ??? ?? ?? ?????.

??: ??$(content).insertBefore(selector)

????:

???? Description
content ?????. ??? ??? ?????. ??? ?: ??? ??? HTML ??
selector ?????. ??? ??? ??? ??? ?????.

jquery insertBefore() ??? ?

<html>
<head>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
  $("button").click(function(){
    $("<span>你好！</span>").insertBefore("p");
  });
});
</script>
</head>

<body>
<p>這是一個段落。</p>
<p>這是另一個段落。</p>
<button>在每個 p 元素之前插入 span 元素</button>
</body>
</html>
???? ?? ?

??? ????? ??? "???? ??" ??? ?????