//迭代数组
        var something = (function(array){
            var arr = array		//数组
            var nextVal;	//遍历的下个值
            var i = 0;		//用作数组索引

            return {
                [Symbol.iterator]:function(){
                    return this;
                },

                next:function(){
                    var done = false;
                    if(i < arr.length){
                        nextVal = array[i];
                    }else{
                        done = true;
                    }
                        
                    
                    i++
                    return {done:done, value:nextVal}
                }
            }
        })([10,50,99,-1])	//传入数组
		//进行迭代
        for(let j of something){
            console.log(j)
        }

//迭代对象
        var person = {
            name:'zhangs',
            age:18,
            sex:'male'
        }

        var another = (function(obj){
            var obj = obj;	//对象
            var nextVal;	//遍历的下一个值
            var propertyList = Object.keys(obj);	//获取所有键，并以数组形式返回
            var i = 0;	//数组见的索引

            return {
                [Symbol.iterator]:function(){return this},
                next:function(){
                    var done = false
                    if(i < propertyList.length){
                        //每对键值都是一个对象
                        nextVal = {}
                        var proName = propertyList[i]
                        nextVal[proName] = obj[propertyList[i]]
                    }else{
                        done = true
                    }
                    i++
                    return {done:done,value:nextVal}
                }
            }

        })(person)	//传入对象
   		//进行迭代
        for(let j of another){
            console.log(j)
        }


        for(let j of another){
            console.log(j)
        }