属性扩展-入门

//property 属性 可以向对象添加属性和方法

function employee(name,job,born){

this.name = name;

this.job = job;

this.born = born;

}

var bill = new employee("Bill Gates","Engineer","1985");

employee.prototype.salary = null;

bill.salary = 2000;

console.log(bill);

console.log(bill.salary);

var arr = [1,2,3,5,6,32];

//为脚本环境内建对象添加方法

Array.prototype.max = function(){

var i,max = this[0];

for(i=0;i<this.length;i++){

if(max<this[i]){

max = this[i];

}

}

return max;

}

console.log(arr.max());

//为用户自定义类添加方法

function TestObjet(name){

this.name = name;

}

TestObjet.prototype.ShowName = function(){

alert(this.name);

}

var testObj = new TestObjet("Tom");

testObj.ShowName();

//对象间实现继承

function TestObjA () {

this.MethodA = function(){

alert("TestObjA.methodA");

}

}

function TestObjB () {

this.MethodB = function(){

alert("TestObjB.methodB");

}

} 

function TestObjC () {

this.MethodC = function(){

alert("TestObjC.methodC");

}

}

TestObjB.prototype.a = new TestObjA();

TestObjB.prototype.c = new TestObjC();

var myObj = new TestObjB();

myObj.a.MethodA();

myObj.MethodB();

myObj.c.MethodC();

//为js对象扩展

console.log("为js对象扩展");

Number.prototype.add = function(num){

return this+num;

}

console.log((3).add(5));

//js 为Boolean 对象添加“布尔值取反”功能

console.log("js 为Boolean 对象添加“布尔值取反”功能");

Boolean.prototype.rev=function(){

return !this;

}

console.log((true).rev());

//为Array对象添加“在数组末尾加入一个新的元素”功能

Array.prototype.push = function(ele){

this[this.length] = ele;

return this;

}

Array.prototype.pushPro = function(){

var currenLength = this.length;

for(var i=0;i<arguments.length;i++){

this[currenLength+i] =arguments[i];

}

return this.length;

}

var arr=[1,2,3];

arr.push(4);

console.log(arr);

arr.pushPro(5,6,7);

console.log(arr);

//js 日期格式获取

Date.prototype.format = function(fmt) {

var o = {

"M+":this.getMonth()+1,     //月份

"d+":this.getDay(),

"h+":this.getHours(),

"m+":this.getMinutes(),

"s+":this.getSeconds(),

"q+":Math.floor((this.getMonth()+3/3)),   //季度

"S":this.getMilliseconds()       //毫秒

};

if(/(y+)/.test(fmt)) {

           fmt=fmt.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length)); 

   }

   for(var k in o) {

       if(new RegExp("("+ k +")").test(fmt)){

            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));

        }

    }

   return fmt; 

}

var time = new Date().format("yyyy-MM-dd hh:mm:ss");