使用 js 简单的实现 bind、call 、aplly

		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);