jquery第二期:三个例子带你走进jquery

jquery是完全支持css的,我们举个例子来看看使用jquery的方便之处,这功劳是属于选择器的:

 例1:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="jquery-1.10.1.js"></script>
<script type="text/javascript">
   $(function()
   {
      $("li.abc").css("color","red");
	   });
</script>
</head>
<body>
<div id="hello">
  <ul>
    <li>niujiabin</li>
    <li class="abc">maybe</li>
    <li>gossipgo</li>
  </ul>	
</div>

</body>
</html>

我们想要做到改变maybe字体颜色为红色

 $("li.abc")

利用选择器可以直接获取到,非常方便,如果利用javascript获取就很麻烦


.css("color","red");

<li>之间的文本就会变成红色


运行结果:

例2:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="jquery-1.10.1.js"></script>
<script type="text/javascript">
   $(function()
   {
      $("#hello ul li:even").css("background","grey").css("color","red");
	   });
</script>
</head>
<body>
<div id="hello">
  <ul>
    <li>niujiabin</li>
	<li class="abc">maybe</li>
	<li>gossipgo</li>
  </ul>	
</div>

</body>
</html>
$("#hello ul li:even")

选取id为hello下的ul下的li的奇数行。

.css("color","red");

改变奇数行的颜色


运行结果:



例3:


<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<style type="text/css">
.bg{
background:#f00;
color:#fff;
}
</style>
<script type="text/javascript" src="jquery-1.10.1.js"></script>
<script type="text/javascript">
   $(function()
   {
     $("li").mouseover(setColor).mouseout(setColor);

	 function setColor()
	 {
		 $(this).toggleClass("bg");
	 }
	   });
</script>
</head>
<body>
<div id="hello">
  <ul>
    <li>niujiabin</li>
	<li class="abc">maybe</li>
	<li>gossipgo</li>
  </ul>	
</div>

</body>
</html>
<style type="text/css">
.bg{
background:#f00;
color:#fff;
}
</style>

css样式,设置背景色和颜色


$("li").mouseover(setColor).mouseout(setColor);
为li添加事件


运行结果是鼠标放到哪就会显示变化,离开就会消失。


原文地址:https://www.cnblogs.com/pangblog/p/3331394.html