简书链接:js判断url中是否有标记参数有就设置divstyledisplayblock
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html
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<!DOCTYPE html>
<html>
<body>

<button onclick="checkDebug()">Check Debug</button>

<div id="myDiv" style="display: none;">
  This div will only show if debug parameter is present in URL.
</div>

<script>
function checkDebug() {
  const urlParams = new URLSearchParams(window.location.search);
  const debugParam = urlParams.get('debug');

  if (debugParam !== null && debugParam.toLowerCase() === 'true') {
    document.getElementById("myDiv").style.display = "block";
  }
}
</script>

</body>
</html>