myBind.js

Function.prototype.myBind = function(_this, _args){
  var that = this
  var args = Array.prototype.slice.call(arguments)
  return function(){
    //console.log(arguments)
    var args1 = Array.prototype.slice.call(arguments)
    var args2 = args.slice(1, args.length).concat(args1)
    that.apply(_this, args2)
  }
}

var a = function(){
  console.log(this, arguments)
}
a.prototype.haha = function(){
  console.log('haha')
}

var b = function(){
  var happy = true
}
b.prototype.lol = function(){
  console.log('lol')
}

var c = a.myBind(b, 1, 2, 3)
c(4, 5)
//Object {happy: true} [1, 2, 3, 4, 5]

// c.haha()
// VM3887:2 Uncaught TypeError: c.haha is not a function(…)(anonymous function) @ VM3887:2InjectedScript._evaluateOn @ VM2293:904InjectedScript._evaluateAndWrap @ VM2293:837InjectedScript.evaluate @ VM2293:693
// c.lol()
// VM3914:2 Uncaught TypeError: c.lol is not a function(…)