js中call、apply、bind的区别

var Person = {  name : 'alice',  say : function(txt1,txt2) {    console.info(txt1+txt2);    console.info(this.name);  }}var Dog = {  name : 'tom',  say : function(txt1,txt2) {    console.info(txt1+txt2);    console.info(this.name);  }}var arr = ['hello','hi'];Person.say('hello','hi');Dog.say('wang~','wang2~');Person.say.call(Dog,'hello','hi');//Person.say内部的this指向了Dog，多个参数用逗号隔开Person.say.apply(Dog,arr);//第二个参数是数组，参数数量可以是未知的var PersonSay = Person.say.bind(Dog,'hello','hi');//不会立即执行，触发返回函数才会执行PersonSay();>>>hellohi>>>alice>>>wang~wang2~>>>tom>>>hellohi>>>tom>>>hellohi>>>tom>>>hellohi>>>tom

来源：https://www.cnblogs.com/Alice-Xu/p/8798503.html