Results 2 issues of garett

标签名字一样的情况下会发生更新错误,和removeTag全部移除的错误行为

when i npm install and import vue-qr-reader,there is a error. vue is not defined ![image](https://user-images.githubusercontent.com/26628321/41193345-4db5b428-6c3d-11e8-88bb-3437ce7e9207.png)