<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
function drag(obj)
{
this.obj=$("#"+obj);
alert($("#dd").css("height"));//为什么这段会无效 弹出的是undefined
}
</script>
<div id="dd" style=" width:100px; height:100px; border:#FF0000 solid 1px; position:absolute; left:0px; top:0px;"></div>
<script type="text/javascript">
var a=new drag("dd");
</script>先谢过了
<script type="text/javascript">
function drag(obj)
{
this.obj=$("#"+obj);
alert($("#dd").css("height"));//为什么这段会无效 弹出的是undefined
}
</script>
<div id="dd" style=" width:100px; height:100px; border:#FF0000 solid 1px; position:absolute; left:0px; top:0px;"></div>
<script type="text/javascript">
var a=new drag("dd");
</script>先谢过了
$("#dd").css("height")这是把IDdd高输出,你有id为dd的对象吗
try
var a=new drag(document.getElemengtById("dd")); or
var a=new drag(${"#dd"});
有三种改正方式
1,写在页面的最下面。
2,写在window.onload=function(){}中,
3,$(document).ready(写在这里面)
<script type="text/javascript">
$(document).ready(function() {
var a=new drag("dd");
});function drag(obj){
//this.obj=$("#"+obj);
alert($("#dd").css("height"));
}
</script>
<script type="text/javascript" charset="gb2312" src='jquery-1.3.1.min.js'> </script>
<script type="text/javascript">
function drag(obj)
{
this.obj=$("#"+obj);
alert($("#dd").css("height"));//为什么这段会无效 弹出的是undefined
}
</script>
</head> <body>
<div id="dd" style=" width:100px; height:100px; border:#FF0000 solid 1px; position:absolute; left:0px; top:0px;"> </div>
<script type="text/javascript">
var a=new drag("dd");
</script>
</body> </html>
测过了.完全没问题的弹出100px.用的是IE8和FF3.0.6
1楼2楼大概都没看到你的DIV的ID就是DD