工作中常常会创建一个函数来解决一些需求问题，以下是个人在工作中总结出来的创建函数20种方式，你知道多少？

function sayHello(){ console.log('hello');}function leave(){ console.log('goodbye');}//testsayHello();

为完成需求，赶紧声明一个函数吧

var sayHello = function(){ console.log('hello');}var leave = function(){ console.log('goodbye');}//testleave();

有求必应，函数表达数来解决

var Action = { sayHello : function(){ console.log('hello'); }, leave : function(){ console.log('goodbye'); }}//testAction.sayHello();

创建一个方法对象类看起来更整洁

var Action = function(){};Action.sayHello = function(){ console.log('hello');}Action.leave = function(){ console.log('goodbye');}//testAction.sayHello();

为单体添加属性方法，净化命名空间

var Action = function(){ return { sayHello : function(){ console.log('hello'); }, leave : function(){ console.log('goodbye'); } }}// //testvar a = Action();a.leave();

返回新对象我们还有更多的事情可以做

var Action = function(){};Action.prototype.sayHello = function(){ console.log('hello');}Action.prototype.leave = function(){ console.log('goodbye');}//testvar a = new Action();a.sayHello();

原型链指向防止创建多次

var Action = function(){};Action.prototype = { sayHello : function(){ console.log('hello'); }, leave : function(){ console.log('goodbye'); }}//testvar a = new Action();a.leave();

对象赋给原型看上去更整洁

var Action = function(){ this.sayHello = function(){ console.log('hello'); } this.leave = function(){ console.log('goodbye'); }}//testvar a = new Action();a.leave();

别忘了还可以在类的内部添加属性

Function.prototype.sayHello = function(){ console.log('hello');}Function.prototype.leave = function(){ console.log('leave');}//testvar f = function(){};f.sayHello();

基类原型拓展，新的一片空间

Function.prototype.addMethod = function(name, fn){ this[name] = fn;}var methods = function(){};methods.addMethod('sayHello', function(){ console.log('hello');});methods.addMethod('leave', function(){ console.log('leave');});//testmethods.sayHello();

通用定义方法函数使用更方便

Function.prototype.addMethod = function(name, fn){ this.prototype[name] = fn;}var Methods = function(){};Methods.addMethod('sayHello', function(){ console.log('hello');});Methods.addMethod('leave', function(){ console.log('leave');});//testvar a = new Methods();a.leave();

原形赋值我们还可以用类操作

Function.prototype.addMethod = function(name, fn){ this[name] = fn; return this;}var methods = function(){};methods.addMethod('sayHello', function(){ console.log('hello');}).addMethod('leave', function(){ console.log('leave');});//testmethods.leave();

链式操作有何不可

Function.prototype.addMethod = function(name, fn){ this.prototype[name] = fn; return this;}var Methods = function(){};Methods.addMethod('sayHello', function(){ console.log('hello');}).addMethod('leave', function(){ console.log('leave');});//testvar a = new Methods();a.leave();

原型+链式=更进一步

Function.prototype.addMethod = function(obj){ for(var key in obj){ this[key] = obj[key]; }}var methods = function(){};methods.addMethod({ sayHello : function(){ console.log('hello'); }, leave : function(){ console.log('goodbye'); }});//testmethods.leave();

添加对象一次做得更多

Function.prototype.addMethod = function(obj){ for(var key in obj){ this.prototype[key] = obj[key]; }}var Methods = function(){};Methods.addMethod({ sayHello : function(){ console.log('hello'); }, leave : function(){ console.log('goodbye'); }});//testvar a = new Methods();a.leave();

原型有什么不可以

Function.prototype.addMethod = function(obj){ for(var key in obj){ this[key] = obj[key]; } return this;}var methods = function(){};methods.addMethod({ sayHello : function(){ console.log('hello'); }}).addMethod({ leave : function(){ console.log('goodbye'); }});//testmethods.leave();

函数式添加对象也可以链式操作

Function.prototype.addMethod = function(obj){ for(var key in obj){ this.prototype[key] = obj[key]; } return this;}var Methods = function(){};Methods.addMethod({ sayHello : function(){ console.log('hello'); }}).addMethod({ leave : function(){ console.log('goodbye'); }});//testvar a = new Methods();a.leave();

类的链式操作也可以做得更多

Function.prototype.addMethod = function(){ if(arguments.length < 1) return; var tostring = Object.prototype.toString; if(tostring.call(arguments[0]) === '[object Object]'){ for(var key in arguments[0]){ this[key] = arguments[0][key]; } }else if(typeof arguments[0] === "string" && tostring.call(arguments[1]) === '[object Function]'){ this[arguments[0]] = arguments[1]; } return this;}

函数添加封装一下

Function.prototype.addMethod = function(){ if(arguments.length < 1) return; var tostring = Object.prototype.toString; if(tostring.call(arguments[0]) === '[object Object]'){ for(var key in arguments[0]){ this.prototype[key] = arguments[0][key]; } }else if(typeof arguments[0] === "string" && tostring.call(arguments[1]) === '[object Function]'){ this.prototype[arguments[0]] = arguments[1]; } return this;}

类式添加追求的就是个性化

Function.prototype.addMethod = function(){ if(arguments.length < 1) return; var cout = 0, tostring = Object.prototype.toString, that; if(typeof arguments[0] === "boolean" && arguments[0]){ cout++; that = this; }else{ that = this.prototype; } if(tostring.call(arguments[cout]) === '[object Object]'){ for(var key in arguments[cout]){ that[key] = arguments[cout][key]; } }else if(typeof arguments[cout] === "string" && tostring.call(arguments[cout + 1]) === '[object Function]'){ that[arguments[cout]] = arguments[cout + 1]; } return this;}//textvar Text1 = function(){};Text1.addMethod('sayHello', function(){console.log('last say hello!')}).addMethod('leave', function(){console.log('last goodbye!')});var t = new Text1();t.sayHello();t.leave();var test2 = function(){};test2.addMethod(true, 'sayHello', function(){console.log('last say hello!')}).addMethod(true, 'leave', function(){console.log('last goodbye!')});test2.sayHello();test2.leave();

追求个性化，这么做不必说为什么

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