js之局部变量转换全局变量教程

js——局部变量转换全局变量

        function enjoy1(){
            var num1=100;
        }
        enjoy1();
        console.log(num1);//报错：num is not defined

1、

        function enjoy2(){
            var num2=100;
            window.num2=num2;
        }
        enjoy2();
        console.log(num2);//100

2、

         function test(){
            var age=19;//局部
            return function(){
                console.log(age);
            }
        }
        var func=test();//获取局部变量，这一步不可少
        func();//19