Question

在extjs4.2;

在以下代码中，显示＆＃34; Uncaught ReferenceError：config未定义＆＃34;在chrome的控制台上。

可能是问题所在 Vehicle.prototype.constructor.call（此，配置）; 但是，为什么它无法通过配置。

为什么呢？有人能帮助我吗？

谢谢。

function Vehicle(config){
   this.x=config.x;
   this.y=config.y;
}

Vehicle.prototype.move=function(dx,dy){
   this.x +=dx;
   this.y +=dy;
};

Vehicle.prototype.toString=function(){
   return "point:"+x+","+y;
};

var Car=Ext.extend(Vehicle,{  
     constructor:function(){  
       Vehicle.prototype.constructor.call(this,config);
       this.color=config.color;
     },move:function(dx){  
         this.x=dx;
     },toString:function(){
        var str="Car is "+ this.x + " miles away from the origial position.";
        str +=" this car is :"+this.colr;
        return str;
     }

});

var carConfig={
    x:10,
    y:0,
    color:"white"
};

var car= new Car(carConfig);
car.move(150);
console.info(car.toString());

Answer 1

您缺少的是构造函数的参数。

我做了一个小提琴来表示你：http://jsfiddle.net/edhedges/JkPLL/

function Vehicle(config){
   this.x=config.x;
   this.y=config.y;
}

Vehicle.prototype.move=function(dx,dy){
   this.x +=dx;
   this.y +=dy;
};

Vehicle.prototype.toString=function(){
   return "point:"+x+","+y;
};

var Car=Ext.extend(Vehicle,{  
     constructor:function(config){ // missing config here
       Vehicle.prototype.constructor.call(this,config);
       this.color=config.color;
     },move:function(dx){  
         this.x=dx;
     },toString:function(){
        var str="Car is "+ this.x + " miles away from the origial position.";
        str +=" this car is :"+this.colr;
        return str;
     }

});

var carConfig={
    x:10,
    y:0,
    color:"white"
};

var car= new Car(carConfig);
car.move(150);
console.info(car.toString());

Extend的构造函数找不到config parm？

1 个答案: