Question

我正在尝试使用二维数组来实例化一个对象，但以下代码似乎不起作用：

      $.each(series, function (i, s) {
          debugger;
          $.each(s.points, function (j, p: any) {
            debugger;
            topPosition.push(p);
          });
        });


topPosition[index].dataLabel.translateY

https://jsbin.com/worepeb/edit?js,console

Answer 1

您需要初始化子数组才能填充数字 - this.board[i] = [];：

＆＃13;

class Board {
  constructor(row,col){
    this.board=[];
    for (var i=0; i<row; i++){
      this.board[i] = []; // init this.board[i]
      for (var y=0; y<col; y++){
        this.board[i][y]=0;
      }
    }
  }
}

var board = new Board(10,10);

console.log(board);

＆＃13;

您也可以使用Array.from()来启动董事会：

＆＃13;

class Board {
  constructor(row,col){
    this.board = Array.from({ length: row }, () => 
      Array.from({ length: col }, () => 0)
    );
  }
}

const board = new Board(10,10);

console.log(board);

＆＃13;

如何用二维数组实例化一个类对象？

1 个答案: