js循环给数组里的对象赋值问题

现在有一个数组是这样：

weekData: [
        { Mon: '13', Tues: '14', Wed: '15', Thur: '16', Fri: '17', Sat: '18', Sun: '19' }
      ]

我要怎么循环7次给他们都赋上值

你这什么结构啊，直接写成对象不好吗，还有你循环要赋同一个值吗，也不说清楚？

    const weekData = [
      {
        Mon: "13",
        Tues: "14",
        Wed: "15",
        Thur: "16",
        Fri: "17",
        Sat: "18",
        Sun: "19",
      },
    ];
    for (let key in weekData[0]) {
      console.log(weekData[0][key]);
      weekData[0][key] = "赋值";
      console.log(weekData[0][key]);
    }

for(key in weekData)