javaScript中创建数组的3种方式

比眉伴天荒 2022-11-06 01:59 114阅读 0赞

[JS数组定义及详解][JS]

[javascript如何定义数组？][javascript]

**直接上代码和截图**

//javaScript中创建数组的3种方式
    //方式1
    var names = ["令狐冲", "张无忌", "韦小宝", "杨过"];
    for (var index = 0; index < names.length; index++) {
    	console.log(names[index]);
    }
    //方式2
    var citys = new Array("于都县", "兴国县", "会昌县", "赣县");
    for (var index = 0; index < citys.length; index++) {
    	console.log(citys[index]);
    }
    //方式3
    var superStars = new Array(3);//固定数组长度为3
    superStars[0] = "黄晓明";
    superStars[1] = "周杰伦";
    superStars[2] = "Angelababy";
    for (var index = 0; index < superStars.length; index++) {
    	console.log(superStars[index]);
    }
    //
    var hobbys = new Array(4);
    //如下：不按顺序赋值也是可以的
    hobbys[1] = "看书";
    hobbys[3] = "下棋";
    hobbys[0] = "爬山";
    hobbys[2] = "足球";
    for (var index = 0; index < hobbys.length; index++) {
    //可以正常循环打印出来，并不会报错	
    	console.log(hobbys[index]);
    }
    //数组中如果不添加元素，那打印出来的元素的值默认就是undefined
    var score = new Array(3);
    for (var index = 0; index < score.length; index++) {
    	console.log("第" + (index+1) + "个元素的值是" + score[index]);
    }

**运行结果如下：**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2N6aDUwMA_size_16_color_FFFFFF_t_70][]

**再补充点**

//不定义元素个数
    var superStars = new Array();
    superStars[0] = "杨幂";
    superStars[1] = "易烊千玺";
    superStars[2] = "迪丽热巴";
    superStars[3] = "鹿晗";
    superStars[4] = "黄子韬";
    for (var index = 0; index < superStars.length; index++) {
    	console.log(superStars[index]);
    }

**运行结果如下：**

![20210307172716388.png][]

[JS]: https://www.cnblogs.com/miaosen/p/10912830.html
[javascript]: https://www.html.cn/qa/javascript/11527.html
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2N6aDUwMA_size_16_color_FFFFFF_t_70]: /images/20221023/cc15e1e619494d939eb7e33dae6b0efd.png
[20210307172716388.png]: /images/20221023/70761c9ef1794de198fe3cb45e5acf0a.png