<html><body><p>单击按钮创建一个 FORM 和一个 INPUT 元素。</p><button onclick="myFunction()">试一试</button><script>function myFunction() { var x = document.createElement("FORM"); x.setAttribute("id", "myForm"); document.body.appendChild(x); var y = document.createElement("INPUT"); y.setAttribute("type", "text"); y.setAttribute("value", "Donald"); document.getElementById("myForm").appendChild(y);}</script></body></html>