How to add a method to a javascript object? -

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this question has answer here:

i have js constructor:

function myobj(){     this.type = "triangle"; }

how add method like:

triangle.mymethod();

you can use prototypes: 

// 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 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);     };

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