Improve error msg

Author: ta21cos

src/PivotTable.vue

@@ -313,16 +313,7 @@ export default {
       })
     },
     saveTableWithText (format) {
-      switch (format) {
-      case 'csv':
-        downloadTableWith('csv', this.cols, this.colFields, this.rows, this.rowFields, this.rowHeaderSize, this.values, this.filename)
-        break
-      case 'tsv':
-        downloadTableWith('tsv', this.cols, this.colFields, this.rows, this.rowFields, this.rowHeaderSize, this.values, this.filename)
-        break
-      default:
-        break
-      }
+      downloadTableWith(format, this.cols, this.colFields, this.rows, this.rowFields, this.rowHeaderSize, this.values, this.filename)
     }
   },
   watch: {

src/util.js

@@ -1,6 +1,6 @@
 export function downloadTableWith (format, cols, colFields, rows, rowFields, rowHeaderSize, values, filename) {
   if (format !== 'tsv' && format !== 'csv') {
-    throw Error('Invalid format on downloadTable')
+    throw Error('Invalid format on downloading, only "tsv" or "csv" can be used.')
   }
   const _filename = (filename || getFilenameByDate(new Date())) + '.' + format
   const delimiter = format === 'tsv' ? '\t' : ','