Question

我需要一些帮助来修复此代码的错误：

var image = new Array ();
image[0] = "http://placehold.it/20";
image[1] = "http://placehold.it/30";
image[2] = "http://placehold.it/40";
image[3] = "http://placehold.it/50";
var size = image.length
var x = Math.floor(size*Math.random())

$('#random').attr('src',image[x]);

运行HTA（超文本应用程序）时出现的错误是：行：46 错误：属性'$'的值为null或undefined，而不是Function对象。第46行是这一行：

$('#random').attr('src',image[x]);

我发现此代码的问题的链接是here

修改

以下是我整个计划的代码here

有人可以帮我吗？

Answer 1

在文件<head>块

中添加Jquery库

    <script src="//code.jquery.com/jquery-1.9.1.js" type="text/javascript"></script>
   <script>
    $(window).load(function(){
    var image = new Array ();
    image[0] = "http://placehold.it/20";
    image[1] = "http://placehold.it/30";
    image[2] = "http://placehold.it/40";
    image[3] = "http://placehold.it/50";
    var size = image.length
    var x = Math.floor(size*Math.random())

    $('#random').attr('src',image[x]);
    });
   </script>

DEMO

Answer 2

在页面顶部和head标签中包含jquery：

<script src="http://code.jquery.com/jquery-1.10.2.js" type="text/javascript"></script>

再试一次：

$(function(){

    var image = new Array ();
    image[0] = "http://placehold.it/20";
    image[1] = "http://placehold.it/30";
    image[2] = "http://placehold.it/40";
    image[3] = "http://placehold.it/50";
    var size = image.length
    var x = Math.floor(size*Math.random())

    $('#random').attr('src',image[x]);

})

Answer 3

尝试这个..希望它的帮助

 <script src="http://code.jquery.com/jquery-1.9.1.js" type="text/javascript"></script>
  <script type="text/javascript">
    $(window).load(function(){
    var image = new Array ();
    image[0] = "http://placehold.it/20";
    image[1] = "http://placehold.it/30";
    image[2] = "http://placehold.it/40";
    image[3] = "http://placehold.it/50";
    var size = image.length
    var x = Math.floor(size*Math.random())

    $('#random').attr('src',image[x]);
    });
   </script>

Answer 4

您的代码中存在一些错误，这是一个有效的示例......

确保jQuery is included on your page

$(document).ready({

   // jQuery has now loaded on the page

   var image = [];
   image[0] = "http://placehold.it/20";
   image[1] = "http://placehold.it/30";
   image[2] = "http://placehold.it/40";
   image[3] = "http://placehold.it/50";

   var src = image[Math.floor(Math.random() * image.length)];

   $('#random').attr('src',src);

});

link to example

刷新随机图像

4 个答案: