vue-simple-uploader自定義參數

processParams 處理請求參數，預設 function (params) {return params}，一般用于修改參數名字或者删除參數。0.5.2版本後，processParams 會有更多參數：(params, Uploader.File, Uploader.Chunk, isTest)

options: {
          processParams:(file)=>{
            return {
             currentNumber:file.chunkNumber,
             currentSize:file.chunkSize,
             totalChunk:file.totalChunks,
             totalSize:file.totalSize,
             chunkSize:file.chunkSize,
             identifier:file.identifier,
            }
          },
          }