<script>  //生成uuid  var uuidChars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".split("");  function uuid() {    var r;    var uuid = [];    uuid[8] = uuid[13] = uuid[18] = uuid[23] = "-";    uuid[14] = "4";    for (i = 0; i < 36; i++) {      if (!uuid[i]) {        r = 0 | Math.random() * 16;        uuid[i] = uuidChars[(i == 19) ? (r & 0x3) | 0x8 : r];      }    }    return uuid.join("");  }  // 兼容 android  history.replaceState(null, null, "/currentURL?a="+uuid());  // 兼容 ios  $(function () {      var isPageHide = false;      window.addEventListener('pageshow', function () {       if (isPageHide) {        window.location.reload();       }      });      window.addEventListener('pagehide', function () {       isPageHide = true;      });   })</script>