js2csv.js

var csvArray = [];

this.exportOrders.forEach(function(order, index) {
  var csvEntry = [order.id, order.card.from , order.card.to, order.card.content];
  csvArray.push(csvEntry);
});

// http://papaparse.com
var csvString = Papa.unparse({
  fields: ['訂單編號', '卡片 From', '卡片 To', '內容'],
  data: csvArray
});

var encodedUri = encodeURI(csvString);
var link = document.createElement('a');
link.setAttribute('href', 'data:text/csv;charset=utf-8,%EF%BB%BF' + encodedUri);
link.setAttribute('download', '卡片 CSV.csv');
link.click();