bind 仿造 重写bind

Function.prototype.my_bind = function(targ){
  var _this = this;
  return function(){
    _this.apply(targ)
  }
}
function f() {
  console.log(`${this.name}`);
}
var o = {
  name: ‘liu‘
};
f.my_bind(o)();

Function.prototype.my_bind = function(){
  var _this = this;
  var targ = Array.prototype.shift.call(arguments)
  var arg = Array.prototype.slice.call(arguments)
  return function(){
    _this.apply(targ,Array.prototype.concat.apply(arg,arguments))
  }
}
function f(a,b,c) {
  console.log(`${this.name} ${a} ${b} ${c}`);
}
var o = {
  name: ‘liu‘
};
f.my_bind(o,1,2)(3);