前端冷知识 https://www.talkingcoder.com/code/6269320601861816392

bind.js

// 函数的绑定

let sendMsg = {
    ele: document.querySelector('#element'),
    change:function(){
        this.ele.classList.toggle("active"); //改变状态
    }
}

document.querySelector('button')
  .addEventListener('click',
    bind(sendMsg.change,sendMsg)
,false);

function bind(fn, context){
  return function(){
    fn.apply(context, arguments);
  }
}

checkType.js

//检测函数类型
function getType(value){  //基本上可以返回所有的类型，不论你是自定义还是原生
    return Object.prototype.toString.call(value).match(/\s{1}(\w+)/)[1];
}
let obj = new Object();
console.log(getType(obj)); //"Object"

Constructor&prototype.js

function Car(name){
//   this.name = name;
  if(this instanceof Car){
    console.log('has been newed');
    this.name = name;
  }else{
    console.log('need newed');

    return new Car(name);
  }
}

Car.prototype.run = function(){
  console.log(this.name + ' run');
}

var t1 = new Car('t1');
t1.run();

var t2 = Car('t2');
t2.run();

Curry.js

//这是JS高程上面的例子
function curry(fn){
    var args = Array.prototype.slice.call(arguments,1);
    return function(){
      var innerArgs = Array.prototype.slice.call(arguments);  //[3]
      var final = args.concat(innerArgs); //[5,3]
      return fn.apply(this, final);
    }
}
function add(num1,num2){
    return num1+num2;
}
var Cadd = curry(add,5);
console.log(Cadd(3)); //8
console.log(Cadd(5)); //10