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当升级了vue2到vue3后，如果使用了vue-count-to，可能会报：Cannot read properties of undefined (reading '_c')
Cannot read properties of undefined (reading '_c')
这是因为vue-count-to只支持vue2版本
https://github.com/PanJiaChen/vue-countTo
可以看到这个库非常老了。
有以下两种解决方法
文件拷贝
参考
https://blog.csdn.net/m0_50080847/article/details/128203806
升级到 vue3-count-to
参考
https://github.com/xiaofan9/vue-count-to
升级完成后，使用
import countTo from 'vue3-count-to';
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