按下按钮时使用Javascript刷新div内容

<button onclick="refreshDiv()">刷新</button>
<div id="myDiv">原始内容</div>

function refreshDiv() {
  var div = document.getElementById("myDiv");
  div.innerHTML = "刷新后的内容";
}

<script>
  function refreshDiv() {
    var div = document.getElementById("myDiv");
    div.innerHTML = "刷新后的内容";
  }
</script>