编辑下面的代码:【加编码】
<html> <head> <script> function getElements() { var x=document.getElementsByName("x"); alert(x.length); } </script> </head> <body> Cats: <input name="x" type="radio" value="Cats"> Dogs: <input name="x" type="radio" value="Dogs"> <input type="button" onclick="getElements()" value="How many elements named 'x'?"> </body> </html>
结果: 【此窗口】 帮助?
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