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javascript Functions

JavaScriptFirefoxIEHTML 
阅读更多

函数function可以被认为是Object的子类，也就是一个function对象可以拥有自己的变量和其它function对象当属性。

 

<html>

<body>

 

<input type='button' id='btn1' value='按钮1'/>

<input type='button' id='btn2' value='按钮2'/>

<script type='text/javascript'>

function doClick(str){

    if(str!=undefined)

       alert(str);

    else

       alert('varible undefined');

 

}

document.getElementById('btn1').onclick=doClick;

document.getElementById('btn2').onclick=function(){

    doClick('按钮2');

}

</script>

</body>

</html>

以上这段代码可以用来展示带参数的 函数的调用情况，不过在firefox下，点击btn1，alert的是“object MouseEvent"，而在ie下点击btn1，alert的是"varible undefined"。

似乎在firefox下面，如果调用的时候没有指定参数，那么就把鼠标事件当参数传递给函数。

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