這篇文章主要介紹了javascript創建函數的20種方式匯總的相關資料,需要的朋友可以參考下
工作中常常會創建一個函數來解決一些需求問題，以下是個人在工作中總結出來的創建函數20種方式，你知道多少？
? 1 2 3 4 5 6 7 8 function sayHello(){ console.log('hello'); } function leave(){ console.log('goodbye'); } //test sayHello();為完成需求，趕緊聲明一個函數吧
? 1 2 3 4 5 6 7 8 9 var sayHello = function(){ console.log('hello'); } var leave = function(){ console.log('goodbye'); } //test leave();有求必應，函數表達數來解決
? 1 2 3 4 5 6 7 8 9 10 11 var Action = { sayHello : function(){ console.log('hello'); }, leave : function(){ console.log('goodbye'); } } //test Action.sayHello();創建一個方法對象類看起來更整潔
? 1 2 3 4 5 6 7 8 9 10 var Action = function(){}; Action.sayHello = function(){ console.log('hello'); } Action.leave = function(){ console.log('goodbye'); } //test Action.sayHello();為單體添加屬性方法，淨化命名空間
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 var Action = function(){ return { sayHello : function(){ console.log('hello'); }, leave : function(){ console.log('goodbye'); } } } // //test var a = Action(); a.leave();返回新對象我們還有更多的事情可以做
? 1 2 3 4 5 6 7 8 9 10 11 var Action = function(){}; Action.prototype.sayHello = function(){ console.log('hello'); } Action.prototype.leave = function(){ console.log('goodbye'); } //test var a = new Action(); a.sayHello();原型鏈指向防止創建多次
? 1 2 3 4 5 6 7 8 9 10 11 12 13 var Action = function(){}; Action.prototype = { sayHello : function(){ console.log('hello'); }, leave : function(){ console.log('goodbye'); } } //test var a = new Action(); a.leave();對象賦給原型看上去更整潔
? 1 2 3 4 5 6 7 8 9 10 11 12 var Action = function(){ this.sayHello = function(){ console.log('hello'); } this.leave = function(){ console.log('goodbye'); } } //test var a = new Action(); a.leave();別忘了還可以在類的內部添加屬性
? 1 2 3 4 5 6 7 8 9 10 Function.prototype.sayHello = function(){ console.log('hello'); } Function.prototype.leave = function(){ console.log('leave'); } //test var f = function(){}; f.sayHello();基類原型拓展，新的一片空間
? 1 2 3 4 5 6 7 8 9 10 11 12 13 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();通用定義方法函數使用更方便
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 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();原形賦值我們還可以用類操作
? 1 2 3 4 5 6 7 8 9 10 11 12 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();鏈式操作有何不可
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 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+鏈式=更進一步
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 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();添加對象一次做得更多
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 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();原型有什麼不可以
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 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();函數式添加對象也可以鏈式操作
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 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();類的鏈式操作也可以做得更多
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 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; }函數添加封裝一下
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 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; }類式添加追求的就是個性化
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 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; } //text var 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();追求個性化，這麼做不必說為什麼
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