perf: 支持设置列宽

src/lib/_export2Excel.js

@@ -141,6 +141,10 @@ export function export_json_to_excel(th, jsonData, defaultTitle, options = { mer
     merges = merges.map(i => i instanceof Array ? { s: i[0], e: i[1] } : i); // be sort :) # ['A1', 'C1'] => { s: 'A1', e: 'C3' }
     ws['!merges'] = merges;
 
+    if(options.cols){
+      ws["!cols"] = options.cols;
+    }
+
     /* add worksheet to workbook */
     wb.SheetNames.push(ws_name);
     wb.Sheets[ws_name] = ws;

src/lib/index.js

@@ -36,15 +36,22 @@ const vueTableExport = {
             data: [],
             title: 'table',
             header: null,
-            merges: []
+            merges: [],
           }
           // 合并参数
           const _params = Object.assign({}, paramsDefault, params)
           // 从参数中派生数据
           const header = _params.columns.map(e => e.label)
           const data = _params.data.map(row => _params.columns.map(col => row[col.prop]))
+
+          const cols = _params.columns.map(e => {
+            let col = {...e}
+            delete col.label;
+            delete col.prop;
+            return col
+          })
           // 导出
-          Excel.export_json_to_excel(header, data, _params.title, { merges: _params.merges, header: _params.header })
+          Excel.export_json_to_excel(header, data, _params.title, { merges: _params.merges, header: _params.header,cols: cols })
           // 完成
           resolve()
         })