getElementsByName 的应用,获取组的选择值 例子： <html> <head> <title>getElementsByName Sample</title> <mce:script type="text/javascript" language="javascript"><!-- function getColor() { var oColors = document.getElementsByName("rdColor"); var color = ""; for (var i=0;i<oColors.length;i++) { if (oColors[i].checked) { color = oColors[i].value; break; } } if (color == "") alert("Please choose a color!!"); else alert("Your favorite color is: " + color); } // --></mce:script> </head> <body> <form action="javascript:getColor();" method="post"> <fieldset> <legend>What color do you like?</legend> <input type="radio" name="rdColor" value="red" /> Red <br /> <input type="radio" name="rdColor" value="green" /> Green <br /> <input type="radio" name="rdColor" value="blue" /> Blue <br /> </fieldset> <input type="submit" value="Submit" /> </form> </body> </html>