JS

    const randomHex = () => `#${Math.floor(Math.random() * 0xffffff).toString(16).padEnd(6, "0")}`;
    console.log(randomHex());

    var arr = document.getElementsByTagName('li'), temp = [];
    for (var i = 0; i < arr.length; i++) {
      temp.push(arr[i].innerHTML);
    }

    window.onload = function () {
      var li = document.getElementsByTagName("li");
      for (var i = 0; i < li.length; i++) {
        
        for (var num = 0; num < li.length; num++) {
          li[num].style.background = randomHex();
        }

      }
    }

网页加入JS代码，<li>  背景变成随机颜色