前端 js css 加随机数

<script>
  (function () {
    var random = Math.random();
    //处理请求JS文件缓存
    var element = document.getElementsByTagName("script");
    for (var i = 0; i < element.length; i++) {
      if (element[i].src) {
        if (element[i].src.indexOf('?') > -1) {
          element[i].src = element[i].src + '&timestreap=' + random;
        } else {
          element[i].src = element[i].src + '?timestreap=' + random;
        }
      }
    };
    //处理CSS文件缓存
    var link = document.getElementsByTagName("link");
    for (var i = 0; i < link.length; i++) {
      if (link[i].href) {
        link[i].href = link[i].href + '?timestreap=' + random;
      }
    }
  })()
</script>