//1、try catch finally中的return

     var n=1;

     function fun(){

         try{

             n++;

             m++;//报错

             return n;

         }catch(err){

             n++;

             return n;

         }finally{

             n++;

             //return n;

         }

     }

     console.log(fun());//

     console.log(n);//

/*作用域和作用域链*/

	var n=10;

	function fun(n){

		n--;

		console.log(n);

	}

	console.log(fun(n)); //9

	console.log(n); //10

 /*new Function*/

     var i=5;

     function fun(){

         var i=4;

         //var f1=new Function("console.log(i)");

         var f1=function(){console.log(i);};

         console.log(f1);

         f1();

     }

     fun();//

 /*callback 与 this*/

     var o={

         n:1,

         fun:function(){

             var self=this;//留住this

             console.log(self.n++);

             setTimeout(function(){

                 self.fun();

             },1000);

         }

     }

     o.fun();//this-->o

 /*DOM中的闭包问题*/

     function fun(){

         var li=document.getXX...;

         btn.onclick=function(){

             li.xx=xx;

         }//li将永远无法释放，即使刷新页面也不行

     }

 /*引用类型的共有属性*/

     function Student(){}

     Student.prototype.arr=[];

     var lilei=new Student();

     var hmm=new Student();

     lilei.arr.push(1);//this[this.length]=1

     hmm.arr[1]=2;

     console.log(lilei.arr);//[1,2]

     console.log(hmm.arr);//[1,2]

 /*继承父类型共有方法*/

     function Student(){}

     Student.prototype=[];

     var lilei=new Student();

     lilei.push(1);//this[this.length]=value;

     var hmm=new Student();

     hmm.push(2);

     console.log(lilei);

     console.log(hmm);

 /*私有属性，公有属性*/

     function Student(){

         var prop="私有属性";//私有属性

         this.prop="公有属性"; //公有属性

         var fun=function(){//私有方法

             console.log("调用私有方法");

             console.log(prop);

         }

         this.fun=function(){//公有方法

             console.log("调用公有方法");

             fun();//this-->window

             console.log(prop);

             console.log(this.prop);

         }

     }

     var lilei=new Student();

     lilei.fun();//公有

 //阻碍事件

 for(var i=0;i<3;i++){

         setTimeout(function(){

             console.log(i);

         },10)

     }

     alert("hello");

 function MyObj(){

         this.p.pid++;

     }

     MyObj.prototype.p={"pid":0};

     MyObj.prototype.getNum=function(num){

         return this.p.pid+num;

     }

     var obj1=new MyObj();

     var obj2=new MyObj(); //p.pid=2

     console.log(obj1.getNum(1)+obj2.getNum(2));//

 /**/

     function fun(n,o){

         console.log(o);

         return {fun:function(m){

                 return fun(m,n);

             }

         }

     }

     var a=fun(0);//undefined

     //a-->{fun:function(m){return fun(m,n)}}

     a.fun(1); a.fun(2); a.fun(3); //0 0 0

     var b=fun(0).fun(1).fun(2).fun(3); //0 1 2

     var c=fun(0).fun(1); c.fun(2);c.fun(3); //0 1 1