只需将 intervalID 设为全局变量，方法是将其声明为外部及以上所有函数。

Just make intervalID be global variable by declaring it outside and above all functions.

使用当前代码，其范围仅限于 $（文档）.ready（）方法所以它可能会导致你描述的问题。

With your current code its scope is limited to $(document).ready() method so it might cause the problem you describe.