mouseover 有关问题

2012-03-31

mouseover 问题一个DIV鼠标在上面移动，只要一直在范围内，只会触发一个onmouseover事件但是假如这个DIV中还

mouseover 问题
一个DIV鼠标在上面移动，只要一直在范围内，只会触发一个onmouseover事件

但是假如这个DIV中还嵌套有n个子DIV，那么在这n个子DIV之间移动的时候，每跨越一次DIV就是触发一次onmouseover事件。

代码如下：

HTML code

<!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><script>var times = 0;function show(){times = times+1;document.getElementById("times").innerHTML=times;    }</script><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>无标题文档</title></head><body><label id="times"></label><div id="popWin" onMouseOver="show();" style="width:300px;border:50px solid #06F;height:200px;"><div id="popWin2" style="width:150px;height:200px;float:left;background:#777;"></div><div id="popWin3" style="width:150px;height:200px;float:left;background:#222;"></div></div><br/><div id="popWin4" onMouseOver="show();" style="width:300px;border:50px solid #06F;height:200px;"></div></body></html>

请高手指点这是个什么情况，如何避免多次触发，感觉不像冒泡，因为子DIV上没有onmouseover事件

[解决办法]
<!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>

<script>
var times = 0;
function show(ele){
var fun=arguments.callee.caller;
var evt=fun.arguments[0];
if(evt){//非IE
var that=evt.relatedTarget;
var pos=ele.compareDocumentPosition(that);
if(pos==0||pos==20){
return;
}
}else{//IE
var that=window.event.fromElement;
if(ele==that||ele.contains(that)){
return;
}
}
times = times+1;
document.getElementById("times").innerHTML=times;
}
</script>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>

<body>
<label id="times"></label>
<div id="popWin" onMouseOver="show(this);" style="width:300px;border:50px solid #06F;height:200px;">
<div id="popWin2" style="width:150px;height:200px;float:left;background:#777;">
</div>
<div id="popWin3" style="width:150px;height:200px;float:left;background:#222;">
</div>
</div>

<br/>
<div id="popWin4" onMouseOver="show(this);" style="width:300px;border:50px solid #06F;height:200px;">
</div>

</body>
</html>
[解决办法]

HTML code

<!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>    <script>        var times = 0;        function show() {            times = times + 1;            document.getElementById("times").innerHTML = times;        }    </script>        <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />    <title>无标题文档</title></head><body>    <label id="times">    </label>    <div id="popWin" onmouseover="show();" style="width: 300px; border: 50px solid #06F;        height: 200px;">        <div id="popWin2" onmouseover="event.cancelBubble=true;" style="width: 150px; height: 200px; float: left; background: #777;">        </div>        <div id="popWin3" onmouseover="event.cancelBubble=true;" style="width: 150px; height: 200px; float: left; background: #222;">        </div>    </div>    <br />    <div id="popWin4" onmouseover="show();" style="width: 300px; border: 50px solid #06F;        height: 200px;">    </div></body></html> 
 
[解决办法]
HTML code<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head>    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />    <title>无标题文档</title></head><body>    <label id="times"></label>    <div id="popWin" style="width:300px;border:50px solid #06F;height:200px;">        <div id="popWin2" style="width:150px;height:200px;float:left;background:#777;"></div>        <div id="popWin3" style="width:150px;height:200px;float:left;background:#222;"></div>    </div>        <br/>    <div id="popWin4" style="width:300px;border:50px solid #06F;height:200px;">    </div>        <script>        var times = 0,            showDiv = document.getElementById("times");        document.getElementById('popWin').onmouseover = function(event){            var e = event || window.event,                relatedTarget = e.relatedTarget || e.fromElement;            if(!contains(this, relatedTarget)){                times = times+1;                showDiv.innerHTML=times;               }        }        function contains(elem1, elem2){            if(elem1.compareDocumentPosition){                var state = elem1.compareDocumentPosition(elem2);                return state === 0 || state === 20 ? true : false;            }else{                return elem1.contains(elem2);            }        }    </script></body></html>

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