JS中对象数组操作方法

var data=[
    {invoiceID: "AAA", invoiceCode: "AAA12234", invoiceNumber: "1232353", invoiceType: 1, totalPriceTax: 23},
{invoiceID: "BBB", invoiceCode: "BBB222", invoiceNumber: "22222", invoiceType: 1, totalPriceTax: 27}
];

数组中某列值拼接成字符串

    // 逗号拼接
    this.currentRow.invoiceCode = data
      .map(function(obj: any) {
        return obj.invoiceCode;
      })
      .join(',');
      // 逗号拼接 简化写法
    this.currentRow.invoiceCode = data
      .map((obj: any) => {
        return obj.invoiceCode;
      })
      .join(',');

数组中某列值累加

    // 值累加
    this.currentRow.invoiceAmount = data.reduce(function(total: any, currentValue: any) {
      return total + currentValue.totalPriceTax;
    }, 0);
    this.$forceUpdate();

数组遍历

     this.data.forEach((u: any) => {
        u.invoiceList.forEach((c: any) => {
          this.selectedInvoiceList.push(c);
        });
      });
      
      // 转化成其他
       rowdata.forEach((u: any) => {
        invoicelist.push({
          invoiceCode: u.invoiceCode,
          invoiceNumber: u.invoiceNumber,
          invoiceID: u.invoiceID,
        });
      });

数组过滤(剔除)元素

     that.needRemoveInvoivceCodes = that.selectedInvoiceList.filter(value => {
                return row.invoiceCodes.indexOf(value.invoiceCode) === -1;
              })

数组过滤元素后返回指定列

that.needRemoveInvoivceCodes = that.selectedInvoiceList
                .filter(value => {
                  return row.invoiceCodes.indexOf(value.invoiceCode) === -1;
                })
                .map((obj: any) => {
                  return obj.invoiceCode;
                });