定义和用法
prototype用于向对象添加属性和方法
object.prototype.name = value
实例
function employee(name,job,born){
this.name=name;
this.job=job;
this.born=born;
}
var bill=new employee("Bill Gates","Engineer",1985);
employee.prototype.salary=null;
bill.salary=20000;
document.write(bill.salary);
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