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源代码：
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<!DOCTYPE html> <html> <head> <script> function displayResult() { var x=document.getElementById("blue").defaultChecked; alert(x); } </script> </head> <body> <form> What color do you prefer?<br> <input type="radio" name="colors" id="red">Red<br> <input type="radio" name="colors" id="blue" checked="checked">Blue<br> <input type="radio" name="colors" id="green">Green </form> <button type="button" onclick="displayResult()">Is "Blue" checked by default?</button> </body> </html>
运行结果
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