BootWiki教程网
源代码：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>BootWiki 教程网</title> <script> function displayResult(){ var x=document.getElementById("blue").defaultChecked; alert(x); } </script> </head> <body> <form> 你更喜欢哪种颜色?<br> <input id="red" name="colors" type="radio">红色<br> <input checked="checked" id="blue" name="colors" type="radio">蓝色<br> <input id="green" name="colors" type="radio">绿色 </form> <button onclick="displayResult()" type="button">默认选择蓝色吗?</button> </body> </html>
运行结果