Function.prototype.call2 = function(content) {
  let context = content || window
  context.fn = this
  const args = Array.from(arguments).slice(1).map(a => `'${a}'`)
  const result = eval(`content.fn(${args.join(',')})`)
  delete context.fn
  return result
}

Function.prototype.apply2 = function(content, arr) {
  let context = content || window
  context.fn = this
  let result
  if (!arr) {
    result = eval(`content.fn()`)
  } else {
    const args = arr.map(a => `'${a}'`)
    result = eval(`content.fn(${args.join(',')})`)
  }
  delete context.fn
  return result
}

Function.prototype.bind2 = function(content) {
  const self = this
  const args = Array.from(arguments).slice(1)
  const fnc = function() {}
  const fBound = function () {
    const bindArg = Array.from(arguments)
    return self.apply(this instanceof fnc ? this : content, args.concat(bindArg))
  }
  fnc.prototype = this.prototype;
  fBound.prototype = new fnc();
  return fBound;
}

function _new(fn) {
  const args = Array.from(arguments).slice(1)
  const newObj = {}
  newObj.__proto__ = fn.prototype
  fn.apply(newObj, args)
  return newObj
}