JavaScript 增量数组 React

Question

嗨，这是我的 json 值

constructor() {
  super();
  this.exportpdf = this.exportpdf.bind(this);
  this.state = {
    sales: [
      {
        customStudentId: "2064517",
        studentRoll: 26,
        studentName: "Md. Faiaz Jakir ",
        stdCtExamMarks: [
          {
            viewSerial: 1,
            subjectName: "Bangla ",
            subjectFullMark: 25,
            obtainedMark: 0,
            highestMarks: 25
          }
        ]
      },
      {
        customStudentId: "2065817",
        studentRoll: 27,
        studentName: "Miraj  Bin Atik ",
        stdCtExamMarks: [
          {
            viewSerial: 1,
            subjectName: "English ",
            subjectFullMark: 25,
            obtainedMark: 0,
            highestMarks: 25
          }
        ]
      }
    ]
  };
}

我在这里使用 primereact 数据table。这是我用来在 table>

中显示数据的代码

 <DataTable value={this.state.sales[0].stdCtExamMarks}>
        <Column field="subjectName" header="Subject" />
        <Column field="subjectFullMark" header="Full Mark" />
        <Column field="obtainedMark" header="Obtainedn Mark" />
        <Column field="highestMarks" header="Highest Mark" />
    </DataTable>

我从 this.state.sales[0].stdCtExamMarks 得到的值是 Image Here

但我需要 json 数据中的两个（等等）stdCtExamMarks 值。我该怎么做？

Answer 1

But i need both (and so on) stdCtExamMarks values from the json data. How can i do it?

所以您需要从数组中的每个对象中提取 stdCtExamMarks？您可以使用 map 来执行此操作。它将 return 一个映射对象数组：

<DataTable value={this.state.sales.map(sale => sale.stdCtExamMarks)}>

JavaScript 增量数组 React

JavaScript Incremental Array React

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