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