2018-09-13

bind 的使用示例

var foo = { value: 1 };
function bar() {
  console.log(this.value);
}
var bindFoo = bar.bind(foo);
bindFoo();  // 1

bind 也可以传参

var foo = { value: 1 };
function bar(name, age) {
  console.log(this.value);
  console.log(name);
  console.log(age);
}
var bindFoo = bar.bind(foo, 'daisy');
bindFoo('18'); // 1, daisy, 18

摘自: https://segmentfault.com/a/1190000009271416

Function.prototype.bind2 = function (context) {

    if (typeof this !== "function") {
      throw new Error("Function.prototype.bind - what is trying to be bound is not callable");
    }

    var self = this;
    var args = Array.prototype.slice.call(arguments, 1);
    var fNOP = function () {};

    var fbound = function () {
        self.apply(this instanceof self ? this : context, args.concat(Array.prototype.slice.call(arguments)));
    }

    fNOP.prototype = this.prototype;
    fbound.prototype = new fNOP();

    return fbound;

}