2高级js总结-------数组

1声明方式：

var arr = [元素，元素，元素。。。];

var arr = new Array(元素，元素，元素。。。);

var arr = new Array(3);

arr[0] = 元素;

arr[1] = 元素;

2 举例

//③ 声明
var food = new Array(3);
//给数组丰富元素
food[0] = "bread";
food[1] = "drink";
food[2] = "milk";
food['yuanxiao'] = "元宵";
console.log(food);
//对象访问成员：对象[成员名] 或 对象.成员名
//数组访问元素：数组[下标]
//console.log(food.2);
console.log(food.yuanxiao);   //元宵
console.log(food['yuanxiao']);//元宵

3数组和对象的比遍历

<script type="text/javascript">
var color = ['red','blue','green'];
color['jinse'] = "gold";
color[10] = "pink";

//① for循环遍历，为了遍历效果更好，数组下边最好是0/1/2...规则连续的
//for(var i=0; i<color.length; i++){
//    console.log(i+'--'+color[i]);
//}

//② for-in,数组 和 对象都可以遍历
//for (var 下标变量 in  数组)
for(var k in color){
    console.log(k+'=='+color[k]);
}
</script>