javascript創(chuàng)建函數(shù)的20種方式匯總
工作中常常會創(chuàng)建一個函數(shù)來解決一些需求問題,以下是個人在工作中總結出來的創(chuàng)建函數(shù)20種方式,你知道多少?
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(shù)吧
var sayHello = function(){
console.log('hello');
}
var leave = function(){
console.log('goodbye');
}
//test
leave();
有求必應,函數(shù)表達數(shù)來解決
var Action = {
sayHello : function(){
console.log('hello');
},
leave : function(){
console.log('goodbye');
}
}
//test
Action.sayHello();
創(chuàng)建一個方法對象類看起來更整潔
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,凈化命名空間
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
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(chuàng)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();
對象賦給原型看上去更整潔
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
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
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(shù)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();
原形賦值我們還可以用類操作
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();
鏈式操作有何不可
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+鏈式=更進一步
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();
添加對象一次做得更多
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();
函數(shù)式添加對象也可以鏈式操作
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();
類的鏈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;
}
函數(shù)添加封裝一下
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;
}
類式添加追求的就是個性化
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;
}
//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,這么做不必說為什么
以上所述就是本文的全部內容了,希望大家能夠喜歡。
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