JavaScript call,apply,bind 的用法区别

var obj = {
    name:"一个"
}

function say(firstName,secondName,flag) {
    console.log(`${firstName}${this.name}${secondName},座右铭是：${flag}`);
}

say.call(obj,"我是","前端","no bug no erro!")
say.apply(obj,["我是","前端","no bug no erro!"])

var fn=say.bind(obj)
fn("我是","前端","no bug no erro!")
var fn2=say.bind(obj,"你是")
fn2("前端","no bug no erro!")

// 生成一个随机数
console.log(Math.random().toString(32).slice(2));