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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js
"></script>
</head>
<body>
<!-- attr() removeAttr(); 开始-->
<a id="one" href="">1</a>
<a id="twoid" href="https://www.baidu.com/">2</a>
<script>
$('#one').attr('href','https://www.baidu.com/');
$('#twoid').removeAttr('href');
</script>
<!--结束-->
<!-- css(); width();height(); -->
<img src="https://b-ssl.duitang.com/uploads/item/201303/23/20130323161411_5x2GR.jpeg" alt="">
<!-- 结束 -->
<script>
$('img').css('width',200);
$('img').height(400);
$('img').css({
'width':'300'
});
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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