如何实现微信web端后退强制刷新功能（详细教程）

<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(&#39;pageshow&#39;, function () { 
      if (isPageHide) { 
       window.location.reload(); 
      } 
     }); 
     window.addEventListener(&#39;pagehide&#39;, function () { 
      isPageHide = true; 
     }); 
  })
</script>