Result Size: 625 x 534
x
 
<!DOCTYPE html>
<html>
<body>
<ul id="myList"><li>咖啡</li><li></li><li>牛奶</li></ul>
<p>单击该按钮可删除 ul 的所有子节点。</p>
<button onclick="myFunction()">试一试</button>
<script>
function myFunction() {
  var list = document.getElementById("myList");
  while (list.hasChildNodes()) {
    list.removeChild(list.firstChild);
  }
}
</script>
</body>
</html>