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.*