<html>
<body>
<p>点击按钮创建文本域。</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction() {
var x = document.createElement("INPUT");
x.setAttribute("type", "text");
x.setAttribute("value", "Hello World!");
document.body.appendChild(x);
}
</script>
</body>
</html>