bootstrap 的jq插件 button 结构解析

 

 

首先声明：JS是没有类的概念的，所以的一切都是派生自现有对象的一个副本；如果有面向对象语言的基础，可以当做类来理解；

　　然后这是对jquery对象的插件对象的分析图，同时我是用button对象举例分析的，自己一己之见，，分析之前先

科普对象—构造函数

//构造函数

function myConstructor(messg){

　　　　//this的指向是对象，指向环境一定不要搞混乱，也可以使用apply或者call指定指向环境；

　　this.messg=messg;

　　　　//私有属性

　　var separatorSign='-';

　　var myOwner=this;

　　　　//私有方法

　　function alertMessg(){

　　　　alert(myOwner.messg);

　　}

　　alertMessg(); //调用私有函数;

　　　　//特权函数(也可当做公有函数)  能被公有函数访问，也能访问别人，

　　this.appenToMessg=function(str){

　　　　this.messg+=separatorSign+str;

　　　　alertMessg(); //特权函数可以访问私有对象  因为它在构造函数的作用域里面，而公有函数就不能访问私有成员（私有属性+函数）

　　}

}

　　//公有方法

　　myConstructor.prototype.clearMessg=function(str){

　　　　this.myMessg=' ';　　

　　}

　　//静态属性

　　myConstructor.name='AndanLiu';

　　//静态方法

　　myConstructor.alertName=function(){

　　　　alert(this.name);

　　}

 

　　说明：

　　　　　　1.私有和特权成员在构造函数内部，会被带到任何对象的实例中去；

　　　　　　2.公有的原型成员是对象（构造的函数，匿名的或者有名的都不打紧，姑且当做this，指向一个对象）的的一部分，

　　　　　　　适用于通过new关键字实例话的该对象的每个实例；

　　　　　　3.静态成员只适用于对象——构造函数本身。

 

下面来正式分析：  

　　　　　　　　bootstrap 的 jQuery 对象的插件（会举一个button插件做具体分析）

　　对prototype的解释：

　　　　　　　　　　1.JS规定，每个构造函数都有一个prototype的属性，指向一个对象。就是说一个构造函数存在即有 prototype属性。

　　　　　　　　　　　而且通过  对象.prototype.constructor指向这个构造函数（function（）{...}）;

　　　　　　　　　　2.prototype 是向对象添加属性和方法的，  添加的都是公有的；

　　对_proto_:的理解：

　　　　　　　　　　1.原型链：对象内部初始化一个对象，我们访问一个属性的时候，若不存在，继续往下忘下找，就是下无底线....；

　　　　　　　　　　2.我的理解就是每创建一个对象的时候，就会产生响应的_proto_:function()和_proto_:Object , _proto_:function()是在对象静态成员里面创建，

　　　　　　　　　　　_proto_:Object是在prototype里面创建，只要有一个对象产生，响应的_proto_:function()和_proto_:Object就会随应而生；

　　　　　　　　　　3.像可以给对象添加自定义属性，或者给对象扩充成员；都是_proto_:的功劳；例如：var arr=[0,1,2]  ,你可以使用arr[3]=3来动态的扩充这个数组

　　　　　　　　　　　对象，但如果是C语言或者C++的话，会有内存溢出的，会出错的；

　　对构造函数的理解：

　　　　　　　　　　它就是一个被封装起来的算法而已，就相当是一个内存块， 这个内存块里面写的就是这些方法和属性如何运算的，  要想让它有用，就必须一个变量指向它，向它传递参数，就是信息，然后利用它的方法，对象被封装了而已，外面的必须要引用它才能运算，   就是构造函数赋值给一个变量。

 

 

代码部分分析—button

+function ($) {

  'use strict';

　　　　//创建匿名函数赋值给Button,也就是Button指针指向这块对象的地址； 构造函数  constructor:function(element, options)  类的开始

　　var Button = function (element, options) {...}；

　　　　//DEFAULTS 为对象的静态属性，因为是把Object赋值给它了，而不是Function对象，所以是静态属性，

    　　 //静态对象只适用于构造函数本身，如果用new创建对象实体，DEFAULTS会丢失，静态方法同样是这个道理

　　　  //本插件没有用到new，全部是对象的引用，所以不用担心这个问题。

　　Button.DEFAULTS = {loadingText: 'loading...'}；

　　　　//对象（Button构造函数）的公有方法，它不能访问私有成员（属性+方法），只能被访问和访问 特权方法（这里不写，自行百度...）

　　Button.prototype.setState = function (state){...};

　　Button.prototype.toggle = function () {...};

　　　　//将对象引用存储在变量里面，其实就是将对象的 首地址存在变量old里面， old在 堆 里面存在，它储存着对象的指针， 对象也是在堆里面，当new一个实体时，实体被存储在栈里面

　　var old = $.fn.button;

　　　　//$.fn.button 构造函数，也是button （小写，跟Button对象不一样）对象；   $.button=$.fn.button=$.prototype.button  

 　 $.fn.button = function (option) {...};

　　　　//将Button 的值，就是Button所引用的对象赋值给$.fn.button.Constructor 对象， $.fn.button.Constructor=function(element, options) {...}；

　  $.fn.button.Constructor = Button;   

　　　　//将下面的匿名函数（作用是返回$.fn.button对象，有返回值，变量可以引用它（对象），其实按我的理解也就是返回对象的内存 首地址 ，因为要有一个变量接收它，从而才能指向它使用）

　  $.fn.button.noConflict = function (){...};

　　　　//click 加的命名空间 当点击含有button 、data-api 、'[data-toggle^=button] 就能触发 function (e) {...}

　  $(document).on('click.bs.button.data-api', '[data-toggle^=button]', function (e) {...});

}(jQuery);

代码逻辑图—button

 

　　　　　　以上分析全是个人理解，在此留下本人邮箱：hai33590@163.com,欢迎大家指正！

　　　　　　希望大家多提技术指导，这也是我的第一篇成长的技术博客，记录自己的学习历程，希望少喷多提宝贵意见，谢谢
　　　　

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