: $ is not defined.
时间: 2023-08-30 19:12:02 浏览: 101
当出现"$ is not defined"的错误时,一般是由于没有正确引入jQuery库导致的。jQuery是一个常用的JavaScript库,$符号是它的别名,用于简化代码和操作DOM。要解决这个问题,你需要确保在使用$符号之前已经正确引入了jQuery库。
你可以通过在HTML文件中添加以下代码来引入jQuery库:
```html
<script src="https://cdn.jsdelivr.net/npm/jquery@3.6.0/dist/jquery.min.js"></script>
```
或者你也可以将jQuery库下载到本地,并在HTML文件中引入:
```html
<script src="path/to/jquery.min.js"></script>
```
在确保已经正确引入jQuery之后,你可以再次尝试使用$符号来操作DOM元素和执行jQuery的功能。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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