实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
​x
 
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<!DOCTYPE html>
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<html>
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<head>
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<script>
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function getElements()
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{
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var x=document.getElementsByName("x");
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alert(x.length);
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}
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</script>
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</head>
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<body>
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​
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Cats:
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<input name="x" type="radio" value="Cats">
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Dogs:
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<input name="x" type="radio" value="Dogs">
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​
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<input type="button" onclick="getElements()" value="How many elements named 'x'?">
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​
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</body>
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</html>