javascript创建函数的20种方式汇总

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'); } //test sayHello();

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'); } //test leave();

有求必应，函数表达数来解决

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