js对象实例化

 var bar4 = new RGraph.Bar('cvs', [[21,31,13, 43,42, 25,42, 29,59, 28,40, 10]])

js对象实例化

 

如何实例化呢？

 

见下，如果不用this，不能为RGraph.Bar这个“类”添加属性，可以再调试的时候，发现这些属性是一个一个出现的

 

RGraph.Bar = function (id, data) { // Get the canvas and context objects

this.id = id;

this.canvas = document.getElementById(id);

this.context = this.canvas.getContext ? this.canvas.getContext("2d") : null;

this.canvas.__object__ = this;

this.type = 'bar';

this.max = 0;

this.stackedOrGrouped = false;

this.isRGraph = true;

this.uid = RGraph.CreateUID();

this.canvas.uid = this.canvas.uid ? this.canvas.uid : RGraph.CreateUID();

this.colorsParsed = false;

}

 

里面放入方法也是正常的