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<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="http://www.plcxue.com/" />
<title>plc学堂_www.plcxue.com</title>
<style type="text/css">
div
{
height:150px;
width:150px;
background-color:green;
margin-top:10px;
}
</style>
<script type="text/
javascript" src="mytest/jquery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("div").before("<b> 好好学习</b>");
})
</script>
</head>
<body>
<div></div>
</body>
</html>
<!doctype html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="http://www.plcxue.com/" />
<title>plc学堂_www.plcxue.com</title>
<style type="text/css">
div
{
height:150px;
width:150px;
background-color:green;
margin-top:10px;
}
</style>
<script type="text/javascript" src="mytest/jquery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("button").click(function(){
$(".html").before("<b>好好学习</b>");
$(".text").text("<b>好好学习</b>");
})
})
</script>
</head>
<body>
<div class="html"></div>
<div class="text"></div>
<button>点击查看效果</button>
</body>
</html>
