JS高级---闭包小案例

    //普通的函数
    function f1() {
      var num = 10;
      num++;
      return num;
    }
    console.log(f1()); //11
    console.log(f1()); //11
    console.log(f1()); //11

    //函数模式的闭包
    function f2() {
      var num = 10;
      return function () {
        num++;
        return num;
      }
    }
    var ff = f2();
    console.log(ff());//11
    console.log(ff());//12
    console.log(ff());//13