单击事件删除和刷新div内容

<button id="deleteButton">删除内容</button>
<div id="myDiv">要删除的内容</div>

document.getElementById("deleteButton").addEventListener("click", function() {
  var div = document.getElementById("myDiv");
  div.innerHTML = ""; // 删除div内容
});

<button id="refreshButton">刷新内容</button>
<div id="myDiv">要刷新的内容</div>

document.getElementById("refreshButton").addEventListener("click", function() {
  location.reload(); // 重新加载页面
});

<button id="refreshButton">刷新内容</button>
<div id="myDiv">要刷新的内容</div>

document.getElementById("refreshButton").addEventListener("click", function() {
  var xhr = new XMLHttpRequest();
  xhr.onreadystatechange = function() {
    if (xhr.readyState === 4 && xhr.status === 200) {
      var response = xhr.responseText;
      document.getElementById("myDiv").innerHTML = response; // 更新div内容
    }
  };
  xhr.open("GET", "update.php", true);
  xhr.send();
});