JS随机取数值并赋值

本帖最后由 abc54288 于 2010-03-14 17:50:35 编辑

<script>
var top=Math.round(Math.random()*(1000-100))+100;
var left=Math.round(Math.random()*(600-200))+200;
alert(top+":"+left);
</script>
divid.style.top=xxx;
divid.style.left=xxx;
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>test </title>
<style>
#test{
width:100px;
height:100px;
border:1px solid red;
}
</style>
</head>
<body>
<div id="test"></div>
</body>
</html>
<script>
   var top = Math.round(Math.random()*(1000-100))+100 + "" + "px";
   var left = Math.round(Math.random()*(600-200))+200+ "" + "px";
   document.getElementById("test").style.marginTop = top;
   document.getElementById("test").style.marginLeft = left;
</script>
这个比较完整
<div id="d">我是学习的……
学无止境……
</div>
<script type="text/javascript">
function pos(){
var d=document.getElementById("d");
d.style.left=Math.round((Math.random()*900)+100);
d.style.top=Math.round((Math.random()*400)+200);
setTimeout("pos()",500);
}
window.onload=pos;
</script>
如果这个ID这是这样的形式，如<DIV onmousedown=getFocus(this) id=cc{content.id}>那JS中就不能直接指定某一个ID了，该如何办呢？
那你就用document.getElementByTagName吧取出来再循环