<script>
function Box(){}
Box.prototype=
{
constructor:Box,
name:'lee',
age=100,
run:function()
   {
     return this.name+this.age+'执行';
   }
};
var box=new Box();
alert(box.run());
</script>
============
哪里错了
想弹出 lee100执行

<script>
function Box(){}
Box.prototype=
{
constructor:Box,
name:'lee',
age=100,  //这里的改为age:100,
run:function()
   {
     return this.name+this.age+'执行';
   }
};
var box=new Box();
alert(box.run());
</script>

嗯 多谢 昨天晚上查到了