<html><body><form id="myForm" action="/action_page.php"> <input type="radio" name="sex" id="male" value="male"></form><p>单击该按钮创建一个 LABEL 元素。</p><button onclick="myFunction()">试一试</button><script>function myFunction() { var x = document.createElement("LABEL"); var t = document.createTextNode("Male"); x.setAttribute("for", "male"); x.appendChild(t); document.getElementById("myForm").insertBefore(x,document.getElementById("male"));}</script></body></html>