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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script> function displayResult(){ var x=document.getElementById("email").defaultValue; alert(x); } </script> </head> <body> <form> Email: <input type="text" id="email" value="someone@example.com"> </form> <button type="button" onclick="displayResult()">显示默认值</button> </body> </html>