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ringa_lee
如果你的count等于xxx.size()，没啥大区别，也不会不安全。但问题是你干嘛要这样做呢？要么就只用xxx.at(i)来访问不用iterator；要么纯用iterator来访问
直接用it != xxx.end()来控制不是更好，不必再定义新的变量count来操作
要不就范围for循环或者迭代器？
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
如果你的count等于xxx.size()，没啥大区别，也不会不安全。但问题是你干嘛要这样做呢？要么就只用xxx.at(i)来访问不用iterator；要么纯用iterator来访问
直接用it != xxx.end()来控制不是更好，不必再定义新的变量count来操作
要不就范围for循环或者迭代器？