Javascript 在javascript中显示来自数组的随机图像

show random image from array in javascript

提问by gunericinar

I want to select random images from imgArray to print 16 different images at the same time but can't fill the imgRandom function.

我想从 imgArray 中选择随机图像以同时打印 16 个不同的图像但无法填充 imgRandom 函数。

img = new imgArray(7);
img[0]='1.png';
img[1]='2.png';
img[2]='3.png';
img[3]='4.png';
img[4]='5.png';
img[5]='6.png';
img[6]='7.png';
img[7]='8.png';

var rand=imgArray[math.floor(math.random*imgArray.length)];

function imgRandom(){

}

回答by Siva Charan

Try this function

试试这个功能

function getRandomImage(imgAr, path) {
    path = path || 'images/'; // default path here
    var num = Math.floor( Math.random() * imgAr.length );
    var img = imgAr[ num ];
    var imgStr = '<img src="' + path + img + '" alt = "">';
    document.write(imgStr); document.close();
}

Call the function

调用函数

getRandomImage(ARRAY-VARIABLE, '/images/')

Refer LIVE DEMO. You will see change in image for every refresh

参考现场演示。每次刷新您都会看到图像的变化

回答by extramaster

Use the following code:

使用以下代码：

var imgArray = ['1.png', '2.png', '3.png', '4.png', '5.png', '6.png', '7.png', '8.png'];
var basePath="YOUR_FOLDER_PATH_HERE";

function imgRandom() {
    for (var i = 0; i < 18; i++) {
        var rand = imgArray[Math.floor(Math.random() * imgArray.length)];
        var image = new Image();
        image.src = basePath+rand;
        document.body.appendChild(image);
    }
}

Live Demo| Source

现场演示| 来源

回答by Moritz Roessler

There are some things in your code i would like to point out

我想指出您的代码中的一些内容

• There is no imgArrayin javascript per default (maybe its a constructor of your's)

• You want an Array

• Javascript is case sensitiv, and the Mathobject in js has an capital M

  • math-> Math
• And the randompropertie of the Mathobject, has to be invoked to return a random number
  • random-> random()
  • Math.random()

• imgArray默认情况下没有javascript（也许它是您的构造函数）

• 你想要一个 Array

• Javascript 区分大小写，Mathjs 中的对象有一个大写的 M

  • math-> Math
• 而对象的random属性Math，必须被调用以返回一个随机数
  • random-> random()
  • Math.random()

But to your Question

但是对于你的问题

1. functions take parameters, so could take one param for an array of images

   function (imgArr) {...
   With this you have access to the passed parameter throug imgArr

2. function can return values, so taken Math.randomwe can go on

   function (imgArr) { return imgArr[Math.floor(Math.random() * imgArr.length)] }

3. You don't have to "Dim" Array, and predefine the Elements you gonna put in, you can just do sth. like

   var imgArr = ["img01.png","img02.png",...]
   And var arr=[]would be equals var arr = new Array()

4. So calling this function with your Array couldlook like

1. 函数采用参数，因此可以为一组图像采用一个参数

   function (imgArr) {...
   有了这个，您可以访问传递的参数 imgArr

2. 函数可以返回值，所以Math.random我们可以继续

   函数 (imgArr) { 返回 imgArr[Math.floor(Math.random() * imgArr.length)] }

3. 您不必“变暗”数组，也不必预先定义要放入的元素，您只需做某事即可。喜欢

   var imgArr = ["img01.png","img02.png",...]
   并且var arr=[]将是平等的var arr = new Array()

4. 所以用你的数组调用这个函数可能看起来像

---

---

  var img = ["1.png", "2.png", "3.png", "4.png", "5.png", "6.png", "7.png", "8.png"]
     function imgRandom(imgArr) {
        return imgArr[Math.floor(Math.random() * imgArr.length)];
    }
 console.log(imgRandom(img));