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源代码：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <script> function displayResult(){ var x=document.getElementById("pwd").defaultValue; alert(x); } </script> </head> <body> <form> 密码: <input id="pwd" type="password" value="thgrt456"> </form> <button onclick="displayResult()" type="button">显示默认值</button> </body> </html>
运行结果