<body> <div id="div" style="background: yellow;width:200px;height:200px;"></div> <button onclick="selectDiv()">选择元素</button> <button onclick="deleteDiv()">删除元素</button> <script> var div=document.getElementById("div"); function selectDiv() { var text=document.createTextNode("这是一段文字"); div.appendChild(text); } function deleteDiv() { div.innerHTML=""; } </script> </body>