text: //bind的参数和call一样，而且要返回一个函数
  Function.prototype.myBind = function (ctx, ...args) {
    return (...params) => {
      this.apply(ctx, args.concat(params));
    };
  };
  var obj = {
    name: "小红",
  };
  
  function sayName(age, height) {
    return this.name + age + height;
  }
  
  console.log(sayName.bind(obj, 1)(2));
  