数字排序（按数字顺序降序）- sort()

<p id="demo">单击按钮降序排列数组。</p>

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

<script>

  function myFunction() {

    var points = [40, 100, 1, 5, 25, 10];

    points.sort(function(a, b) {

      return b - a

    });

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

    x.innerHTML = points;

  }

</script>