//数组        //定义方式            //空数组的定义方式            /*var attr = new Array();            var attr = [];            var attr = new Array(3);*/            //有值数组的定义            //var attr = new Array("张三","李四","王五");            //var attr =  ["张三","李四","王五"];            //数组的遍历                /*1.for遍历*/                /*for (var i = 0; i < attr.length;i++) {                    alert(attr[i]);                }                console.log(attr);                0: "张三"​                1: "李四"                ​                2: "王五"                ​                length: 3*/                        //for-in的遍历        /*for (var k in attr) {            alert(attr[k]);        }*/                //定义一个空数组，对他进行赋值        /*var aa = new Array();        aa[0] = "茄子";        aa[1] = "香蕉";        aa[2] = "西瓜";        aa[3] = "苹果";        console.log(aa);*/                //循环赋值        /*for (var i= 0;i<= 5;i++) {            attr[i] = i + 1;        }        attr = [1,2,3,4,5,6];        console.log(attr);*/