vue中使用七牛上传构建上传策略报错

Question

代码如下const putPolicy = new qiniu.rs.PutPolicy({scope: `${bucketName}:${fileName}`,expires: 60 * 60 * 1,returnBody: '{"key":"$(key)","hash":"$(etag)","fsize":$(fsize),"bucket":"$(bucket)","name":"$(x:name)"}'})报错Cannot read property 'PutPolicy' of undefined