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function v(){
this.g = [];
this.c = [];
}//构造器定义实例的属性
v.prototype = {};//原型定义方法与共享属性
var ov=new v();
console.log(ov.g)//[-1, -1, -1, -1, -1, -1, -1]
http://www.ruanyifeng.com/blog/2010/05/object-oriented_javascript_encapsulation.html