运行结果如下图
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Document</title><script type="text/javascript">function Person(name,age){this.name=name;this.age=age;}var p1=new Person("Zhang3",18);var p2=new Person("Li4",19);Person.prototype.salary=null;p1.salary=6000;document.write("p1 name:" p1.name ",p1 age:" p1.age ",p1 salary:" p1.salary "<br/>");</script></head><body></body></html>
评论