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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <meta name="keywords" content="HTML,HTML DOM,JavaScript"> <script> function displayResult(){ var x=document.getElementsByTagName("meta")[0].name; alert(x); } </script> </head> <body> <button type="button" onclick="displayResult()">显示 meta 名称</button> </body> </html>