我有一个使用按钮的组件:
<dx-button text="{{'VIEW_DATA.BUTTON.EXPORT_TO_EXCEL' | translate }}" type="normal" (onClick)="export()" ></dx-button>
在.ts文件中我做:
export() {
let cells = [];
// some code here to fill cells
console.log('exporting component');
this._excelExportService.exportAsExcelFile(cells, 'global_view');
}
export()函数的服务调用是:
import { Injectable } from '@angular/core';
import * as FileSaver from 'file-saver';
import * as XLSX from 'xlsx';
const EXCEL_TYPE = 'application/vnd.openxmlformats- officedocument.spreadsheetml.sheet;charset=UTF-8';
const EXCEL_EXTENSION = '.xlsx';
@Injectable()
export class ExcelExportService {
constructor() { }
public exportAsExcelFile(json: any[], excelFileName: string, header?: any): void {
const worksheet: XLSX.WorkSheet = XLSX.utils.json_to_sheet(json);
const workbook: XLSX.WorkBook = { Sheets: { 'data': worksheet }, SheetNames: ['data'] };
const excelBuffer: any =
XLSX.writeFile(
workbook,
excelFileName + '_export_' + Date.now() + EXCEL_EXTENSION,
{ bookType: 'xlsx', bookSST: false, type: 'buffer' }
);
}
}
当我单击按钮时,export()函数被调用两次,因此我得到两个不同的excel文件和两个console.log()。但如果我只是评论:
export() {
let cells = [];
// some code here to fill cells
console.log('exporting component');
// this._excelExportService.exportAsExcelFile(cells, 'global_view');
}
按预期方式调用该函数一次。
为什么调用我的服务会改变我的功能?