275923543

npm v3+不再默认安装package.json文件peerDependencies下的包，所以koa-art-template 安装后不会自动安装art-template包，运行时报错，有点小不便

### Clear and concise description of the problem Discovered an error in a low version browser during use, such as the code after "core/useEventListener" is built: ``` let t, n,...