1. 返回函数 ~~~ var setup = function() { //函数setup的私有变量 var count = 0; //返回函数访问私有变量 return function() { return (count += 1); }; }; //外部调用返回函数 var next = setup(); alert(next()); //1 alert(next()); //2 alert(next()); //3 alert(next()); //4 ~~~ 2. 返回可变参数的定制函数 ~~~ var setup = function(param) { //函数setup的私有变量 var count = param; //返回函数访问私有变量 return function() { return (count += 1); }; }; //外部调用返回函数 var next = setup(5); alert(next()); //6 alert(next()); //7 alert(next()); //8 alert(next()); //9 ~~~