1
<p id="demo">单击按钮创建button元素</p>2
<button onclick="myFunction()">点我</button>3
<script>4
function myFunction() {5
var btn = document.createElement("BUTTON");6
document.body.appendChild(btn);7
};8
</script>
<p id="demo">单击按钮创建button元素</p><button onclick="myFunction()">点我</button><script> function myFunction() { var btn = document.createElement("BUTTON"); document.body.appendChild(btn); };</script>