var XHRUpload = function(jsonMap){
    this.ok="ok";
    this.element=jsonMap.element;                                                                                                                                                                                                                        
    this.init();                                                                                                                                                                                                                            
}                                                                                                                                                                                                                                          
                                                                                                                                                                                                                                            
XHRUpload.prototype = {                                                                                                                                                                                                                    
    init:function(){
        element=j                                                                                                                                                                                                                        
        alert(this.ok);//这里的警告能正常显示
        element.addEventListener("click", this._stopPrevent, false);                                                                                                                                                                        

    },                                                                                                                                                                                                                                      
                                                                                                                                                                                                                                            
    _stopPrevent:function(e){ //阻止默认动作 和事件冒泡                                                                                                                                                                                    
        e.stopPropagation();                                                                                                                                                                                                                
        e.preventDefault();                                                                                                                                                                                                                
        alert(this.ok);//这里的警告却不能正常显示                                                                                                                                                                                                                    

    }
}  
--
FROM 123.127.134.*

【 在 firegun2012 (firegun) 的大作中提到: 】
: 标  题: javascript中这样做为什么不行呢？
: 发信站: 水木社区 (Tue Jul 12 00:46:48 2011), 站内
:
: var XHRUpload = function(jsonMap){
:     this.ok="ok";
:     this.element=jsonMap.element;                                                                                                                                                                                                                        
:     this.init();                                                                                                                                                                                                                            
: }                                                                                                                                                                                                                                          
:                                                                                                                                                                                                                                            
: XHRUpload.prototype = {                                                                                                                                                                                                                    
:     init:function(){
:         element=j                                                                                                                                                                                                                        
:         alert(this.ok);//这里的警告能正常显示

我一般这样写，你那样整，在onclick的时候此this已经非彼this了。
var thisp = this;
this.element.addEventListener("click", function (e) { thisp._stopPrevent(e); }, false);

:         element.addEventListener("click", this._stopPrevent, false);                                                                                                                                                                        
:
:     },                                                                                                                                                                                                                                      
:                                                                                                                                                                                                                                            
:     _stopPrevent:function(e){ //阻止默认动作 和事件冒泡                                                                                                                                                                                    
:         e.stopPropagation();                                                                                                                                                                                                                
:         e.preventDefault();                                                                                                                                                                                                                
:         alert(this.ok);//这里的警告却不能正常显示                                                                                                                                                                                                                    
:
:     }
: }  
:
: --
:
: ※ 来源:·水木社区 newsmth.net·[FROM: 123.127.134.*]
--
FROM 123.116.133.*

this.element ..
【 在 firegun2012 (firegun) 的大作中提到: 】
: 这样写好麻烦啊
: onclick时候的this是什么呢？
--
FROM 101.38.139.*