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JS 参考手册
Input Password readOnly 属性
tryjsref_password_readonly
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<!DOCTYPE html> <html> <body> Password:<input type="password" id="myPsw" readonly> <p>Click the button to find out whether the password field is read-only, or not.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myPsw").readOnly; document.getElementById("demo").innerHTML = x; } </script> </body> </html>