JavaScript基础------(数组)

数组

  一维数组

    var fruits = ["apple","banana","pear"];

  二维数组

    

var arr2 = new Array();
arr2["湖南"] = ["长沙","湘潭","株洲"];    
arr2["广东"] = ["广州","深圳","珠海"];
            
document.write(arr2.length + "<br>");  //arr2.length = 0
document.write(arr2["湖南"].length + "<br>");
            
for(var i in arr2){
    document.write("<h4>" + i + "</h4>");
    for(var j in arr2[i]){
    document.write(arr2[i][j] + "&nbsp;&nbsp;&nbsp;");
    }
}

  字符串也可以做数组的索引,但是就不能使用for循环了,只可以用for-each循环。

    

posted @ 2020-01-08 19:46  迷惘~徘徊  阅读(100)  评论(0编辑  收藏  举报