使用 js 简单的实现 bind、call 、aplly代码实例

Function.prototype._call = function(obj,...arg){ var me = this; var k = Symbol("test"); //生成唯一的 key obj[k] = me; var result = obj[k](...arg); delete obj[k]; return result;} Function.prototype._apply = function(obj,arg){ var me = this; var k = Symbol("test"); //生成唯一的 key obj[k] = me; var result = obj[k](...arg); delete obj[k]; return result;}Function.prototype._bind = function(obj,...arg){ var me = this; return function(...args){  var param = [...arg,...args];  return me._apply(obj,param); }}   var o1 = { info:"o1", print(){  console.log(arguments)  console.log(this.info) }}var o2 = { info:"o2", print(){  console.log(arguments)  console.log(this.info) }}var o3 = { info:"o3", print(){  console.log(arguments)  console.log(this.info) }} o1.print._bind(o3,11)(44,66);