单击按钮上的Javascript随机图像

问题描述：

我一直在关注如何通过在Javascript中设置数组来随机化图像的一些教程。它不工作 - 图像本身没有出现，甚至没有任何错误。

I've been following some tutorials on how to randomize an image by setting up an array in Javascript. It's not working - the image itself is not appearing, not even any error.

JavaScript

<script type="text/javascript">
    function randomImg1(){
        var myImages1 = new Array ();
        myImages1[1] = "img/who/1.jpg";
        myImages1[2] = "img/who/2.jpg";
        myImages1[3] = "img/who/3.jpg";
        var rnd = Math.floor(Math.random() * myImages1.length);
        if(rnd == 0{
            rnd = 1;
        }
        document.write(<img class="who" src="'+myImages1[rnd]);
    }
</script>

我的按钮看起来像这样

and my button looks like this

<input class="randombutton" style="float: left;" type="button" value="Randomize" onclick="randomImg1()"/>

答

哦这是令人尴尬的，疯狂的你可以在3年内学到多少，我认为这样做的最佳方式是下面的（假设没有文件夹结构模式），没有测试但应该工作。 >

Oh man, this is embarrassing. Crazy how much you can learn in 3 years. I think the most optimal way of doing this would be the following (assuming there is no folder structure pattern). Haven't tested but should work.

var images = ["img/who/1.jpg","img/who/2.jpg","img/who/3.jpg"];

function getRandomImage(){
    var rnd = Math.floor(Math.random() * images.length);
    return images[rnd];
}

function changeImage(){
    var img = document.querySelector("#myImg");
    img.src = getRandomImage();
}

function init(){
    var el = document.querySelector(".myClass");
    el.onclick = changeImage;
}

window.onload = init;

我在想为数组赋值 [1] ，然后做一个 if if check？我永远不会知道。

What was I thinking assigning an array to [1] and then doing an if check? I'll never know.

单击按钮上的Javascript随机图像

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