微信客户端浏览器中添加时间戳骗过浏览器缓存

<button id="refresh" style="position: fixed;top: 50px;left: 50px">刷新一发</button>
<script>
  function convertURL(){
    var url = location.href;
    var timstamp = (new Date).valueOf();
    if (url.indexOf("?")>=0){
      url = url + "&ts=" + timstamp;
    }else {
      url = url + "?ts=" + timstamp;
    }
    location.href = url;
  }
  document.getElementById("refresh").onclick = function(){
    convertURL()
  };
</script>