getDay() - 如何使用 getDay() 和数组来显示星期，而不仅仅是数字。

<p id="demo">单击按钮显示今天周几</p>

<button onclick="myFunction()">点我</button>

<script>

  function myFunction() {

    var d = new Date();

    var weekday = new Array(7);

    weekday[0] = "周日";

    weekday[1] = "周一";

    weekday[2] = "周二";

    weekday[3] = "周三";

    weekday[4] = "周四";

    weekday[5] = "周五";

    weekday[6] = "周六";

    var x = document.getElementById("demo");

    x.innerHTML = weekday[d.getDay()];

  }

</script>