js 對call apply bind理解

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請參考 http://www.cnblogs.com/xljzlw/p/3775162.html
call apply
var mtt = {    name: "mtt",    sayHello: function (age) {         console.log("hello, i am ", this.name + " " + age " years old");     }};var  xjs = {    name: "xjs ",
};mtt.sayHello(24);// hello, i am zlw 24 years old

apply參數需要是數組形式，而call參數需要用逗號隔開24,25

mtt .sayHello.call(xjs , 24);// hello, i am xjs 24 years old
mtt .sayHello.apply(xjs , [24]);// hello, i am xjs 24 years old

bind方法傳遞給調用函數的參數可以逐個列出，也可以寫在數組中。bind方法與call、apply最大的不同就是前者返回一個綁定內容相關的函數

mtt .sayHello.bind(xjs)(24); //hello, i am xlj 24 years oldmtt .sayHello.bind(xjs)([24]); //hello, i am xlj 24 years old

bind

var bind = Function.prototype.call.bind(Function.prototype.bind);var zlw = { name: "zlw" };function hello () {  console.log("hello, I am ", this.name);}bind(hello, zlw)() // hello, I am zlw

 

js 對call apply bind理解