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JS 参考手册
Input Password value 属性
tryjsref_password_value2
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<!DOCTYPE html> <html> <body> <form> Password: <input type="password" id="myPsw"> </form> <p>Write something in the password field, and then click the buttons to display and/or change the value.</p> <button onclick="display()">Display value</button> <button onclick="change()">Change value</button> <script> function display() { var x = document.getElementById("myPsw").value; alert("The value of the password field is: " + x); } function change() { var x = document.getElementById("myPsw").value = "NewPassword123"; alert ("The value was changed to: " + x); } </script> </body> </html>