我们先看一个简单的例子：
<input type="text" onblur="alert(this.value)"/>完全没有问题。
<wbr></wbr>
那么什么情况下不可以用？
fuction method()
{
<wbr><wbr> alert(this.value);</wbr></wbr>
}
<input type="text" onblur="method()"/>这个就不可以，因为method()是被响应函数调用的函数。
<wbr></wbr>
那么这种情况下怎么办？
<wbr></wbr>
方法一:
fuction method(btn)
{
<wbr><wbr> alert(btn.value);</wbr></wbr>
}
<input type="text" onblur="method(this)"/>没问题！
<wbr></wbr>
方法二：
fuction method()
{
<wbr><wbr> alert(window.event.srcElement.value);</wbr></wbr>
}
<input type="text" onblur="method()"/>没问题！window.event.srcElement取得触发事件的控件
<wbr></wbr>
我们在看一个稍微绕一点的例子
<head>
<wbr><wbr><wbr> <script type="text/javascript"><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr> function InitEvent() {<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> var inputs = document.getElementsByTagName("input");<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> for (var i = 0; i < inputs.length; i++) {<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><strong>inputs[i].onblur = OnblurEvent;</strong><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> }<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr> }</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr> function OnblurEvent() {<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><strong><span style="color:#ed1c24">// OnblurEvent是onblur的响应函数，而不是被响应函数调用的函数</span></strong><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span style="color:#ed1c24">
<strong>// 所以可以用this来获取发生事件的对象</strong></span><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> if (this.value.length > 0) {<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> this.style.backgroundColor = "white";<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> }<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> else {<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> this.style.backgroundColor = "red";<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> }<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr> }<br><wbr><wbr><wbr> </script><br>
</head><br>
<body onload="InitEvent()"><br><wbr><wbr><wbr> <input id="Text1" type="text" /><br><wbr><wbr><wbr> <input id="Text2" type="text" /><br><wbr><wbr><wbr> <input id="Text3" type="text" /><br>
</body><br>
</html></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr></wbr>
正如红色注释解说，上面可以用this获得当前触发事件的input。
分享到：
相关推荐
对于js初学着必须理解this和srcElement的应用，这也是面试中经常考到的。下面我们就通过几个示例来详细了解下
event.srcElement.tagName event.srcElement.type 捕获释放 event.srcElement.setCapture(); event.srcElement.releaseCapture(); 事件按键 event.keyCode event.shiftKey event.altKey event.ctrlKey ...
ev = ev || window.event; /* We are setting target to whatever item the mouse is currently on Firefox uses event.target here, MSIE uses event.srcElement */ var target = ev.target || ev....
e = window.event; e.target = e.srcElement; e.layerX = e.offsetX; e.layerY = e.offsetY; } return e; } } window.onload = function(){ var obj = document.getElementById('draggable'); rDrag.init...
if (event.keyCode==13 && event.srcElement.type!=’button’ && event.srcElement.type! =’submit’ && event.srcElement.type!=’reset’ && event.srcElement.type!=’’&& event.srcElement.type!=’...
在b/s开发中经常用到的javaScript技术... a[i].checked = window.event.srcElement.checked; } function checkItem(str) { var e = window.event.srcElement; var all = eval(\"document.hrong.\"+ str); if ...
if(event.keyCode==13 && event.srcElement.type!='button' && event.srcElement.type!='submit' && event.srcElement.type!='reset' && event.srcElement.type!=''&& event.srcElement.type!='textarea'); event....
<script language="javascript" type="text/javascript">//真正的js控制css菜单 function init(){ var arrayDiv=document.getElementById("levelmenu"); var divObj=arrayDiv.getElementsByTagName("div");//div ...
if(Y.event===F||F){L.srcEl=F.srcElement||F.target;F.cancelBubble=true}L.el=L.el=$dp.$(L.el||L.srcEl);if(!L.el||L.el["My97Mark"]===true||L.el.disabled||($dp.dd&&P($dp.dd)!="none"&&$dp.dd.style.left!="-...