/*

     1.把函数作为参数、匿名函数作为参数传递到函数

 */

 function dogEat(food) {

     console.log("dog eat " + food);

 }

 function catEat(food) {

     console.log("cat eat" + food);

 }

 function eat(food, eatFunction) {

     eatFunction(food);

 }

 eat("bone", dogEat);

 eat("fish", catEat);

 eat("rice", function(x) { console.log("eat " + x); })

     /*

         2.模拟实现类似onClick函数

     */

 var server = {

     'successReq': "req-success",

     'successRes': "res-success",

     'failReq': "req-faied",

     'failRes': "res-faied",

     'onFunc': function(type, callback) {

         switch (type) {

             case 'success':

                 callback(this.successReq, this.successRes);

                 break;

             case 'fail':

                 callback(this.failReq, this.failRes);

                 break;

             default:

                 console.log("No type match!");

                 break;

         }

     }

 };

 var obj1 = Object.create(server);

 function display(req, res) {

     console.log("dis-req: " + req + " dis-res: " + res);

 }

 obj1.onFunc("success", display); //$("#button").on('click',xxxFunc);模拟on函数

 obj1.onFunc("fail", function(res, req) {

     console.log("failed: " + res + req);

 })

 /** 3.对象的某个属性是函数 **/

 obj对象的func属性指向匿名函数

 var obj = {

     func:function (){

         console.log("func");

     }

 };

 obj.func // [Function]

 obj.func() //调用函数，控制台打印 func

 obj对象的func属性指向函数f

 var obj = {

     func:function f(){

         console.log("func");

     }

 };

 obj.func // [Function: f]

 obj.func() //调用函数，控制台打印 func

 属性指向有名称的函数似乎没什么用……