W3School TIY Editor
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<!DOCTYPE html> <html> <body> <form> 用户名：<input type="text" id="usrname"><br> 密码：<input type="password" id="myPsw"> </form><br> <button onclick="disablePsw()">禁用密码字段</button> <button onclick="undisablePsw()">取消禁用密码字段</button> <script> function disablePsw() { document.getElementById("myPsw").disabled = true; } function undisablePsw() { document.getElementById("myPsw").disabled = false; } </script> </body> </html>