如何將一個方法添加到JavaScript對象？

Question

我有我的js的構造函數：

Function myobj(){ 
    This.type = "triangle"; 
} 

如何添加一個方法，它喜歡：

Triangle.mymethod(); 

Answer 1

可以使用的原型：

// The standard canvas object 
    function CanvasObj(canvas, x, y, w, h, fill){ 
     this.x = x||0; 
     this.y = y||0; 
     this.w = w||0; 
     this.h = h||0; 
     this.objects = []; 
     this.ctx = context_for(canvas); 
     this.init(canvas, fill); 
    }; 

// Initial set-up of the canvas 
    CanvasObj.prototype.init = function(canvas, fill){ 
     position_element(canvas, this.x, this.y); 
     resize_canvas(canvas, this.w, this.h); 
     draw_rect(this.ctx, 0, 0, this.w, this.h, fill); 
    }; 

Answer 2

您需要擴展的對象原型。

Triangle.prototype.myMethod = function(){ 
    //method here; 
    console.log(this.type); //you can reference the instance via this 
};