使用try finally很容易解決些問題
代碼如下:
function createButton(){
var obj = document.createElement("button");
obj.innerHTML="點我!";
obj.onclick=function(){
//處理click事件
}
obj.onmouseover=function(){
//處理mouseover事件
}
try{
return obj;
}finally{
obj = null;//這句話在return 之后才執行,有效地解決了需在return后將obj置null的問題
}
}
一個函數或方法中，其實有很多地方都需要這種選返回值，最后執行某些事的
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附一:JavaScript Error (try/catch/finally)
Introduction
Like other programming languages, JavaScript provides the possibility to make use of
the try/catch/finally block. Usually when an error is encountered then the script stops and doesn't
continue with the rest of the page. The try/catch/finally block can be used to continue the
processing with the rest of the page. You just have to put the code in your try block and when
an error in encountered there, then it will call the catch block. The finally block is called always
regardless of an error occurred or not. The following example makes the usage clear.
Example:
[Ctrl+A 全選 注:如需引入外部Js需刷新才能執行]
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