使用jquery时遇到这样的问题,把js脚本放在代码最下面可以使用，放在<head>中不好使。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Hello World jQuery!</title>
<script type="text/javascript" src="scripts/jquery-1.3.2-vsdoc2.js"></script>
</head>
<body>
<div id="divMsg">Hello World!</div>
<input id="btnShow" type="button" value="显示" />
<input id="btnHide" type="button" value="隐藏" /><br />
<input id="btnChange" type="button" value="修改内容为 Hello World, too!" />
<script type="text/javascript" >
$("#btnShow").bind("click", function(event) { $("#divMsg").show(); });
$("#btnHide").bind("click", function(event) { $("#divMsg").hide(); });
$("#btnChange").bind("click", function(event) { $("#divMsg").html("Hello World, too!"); });
</script>
</body>
</html>
不好使的情况
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Hello World jQuery!</title>
<script type="text/javascript" src="scripts/jquery-1.3.2-vsdoc2.js"></script>
<script type="text/javascript" >
$("#btnShow").bind("click", function(event) { $("#divMsg").show(); });
$("#btnHide").bind("click", function(event) { $("#divMsg").hide(); });
$("#btnChange").bind("click", function(event) { $("#divMsg").html("Hello World, too!"); });
</script>
</head>
<body>
<div id="divMsg">Hello World!</div>
<input id="btnShow" type="button" value="显示" />
<input id="btnHide" type="button" value="隐藏" /><br />
<input id="btnChange" type="button" value="修改内容为 Hello World, too!" />
</body>
</html>
