js学习第2天：function

<script type="text/javascript">
        //=========普通写法=========
         function abc(){
             alert("abc");
         }
         abc();//abc
         
         //=========参数匿名函数,有顺序=========
         var bcd = function(name){
             alert(name);
         }
         bcd("haha");//haha
         
         //=========匿名函数2=========
         (function(){
             alert("匿名函数");
         })
         ();
         
         //=========匿名函数的3 =========
         var f = new Function('name','age','alert(name+age);');
         f("mapanguan","30");
         alert(f instanceof Function); //true
         

        function show(){
            
        }
        var f = show();
        alert(f);//unddfinded
        
        //=========函数返回值========
        function returnFunction(){
            return "abc"
        };
        alert(returnFunction);
        var rf = returnFunction();
        alert(rf);//abc
        
        
        //=========内部函数========
        function show01(){
            return function(){
                alert("hehe");
            }
        }
        var abc = show01();
        abc();//hehe
        
        
        //=========局部函数，闭包：有权访问另一个函数作用域当中的变量=========
        function f1(){
            var num = 1;
            function f2(){
                alert(num);
            }
            return f2;
        }
        var f = f1();
        f();//1
    </script>