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老师批语：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>获取鼠标坐标</title>
<style type="text/css">
*{margin:0;padding: 0}
.box{margin:50px auto;width:500px;height:500px;}
#main{
margin:100px auto;
width:100%;
height:100%;
border: 2px solid red;
}
p{margin:50px auto;width:500px;height:40px;line-height: 40px;border: 2px solid red;}
</style>
</head>
<body>
<div class="box">
<div id='main'></div>
<br>
<p>当前鼠标位置<span id='info'>(0,0)</span></p>
</div>
<script type="text/javascript">
window.onload=function(){
var divObj=document.getElementById('main');
divObj.onmousemove=function(event){
var e=event||window.event;
//获取鼠标坐标
var m_x=e.clientX;
var m_y=e.clientY;
var d_x=this.offsetLeft;
var d_y=this.offsetTop;
var x=m_x-d_x;
var y=m_y-d_y;
info.innerHTML='('+x+','+y+')';
}
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
心得：
实现的过程中出了BUG，总是不能显示数据
发现了window.onload=function()后面的花括号没有成对，导致了BUG
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