​x
 
<!DOCTYPE html>
<html>
<body>
​
密码：<input type="password" id="myPsw">
​
<p>单击按钮可将密码字段设置为只读。</p>
​
<p><b>提示：</b>如需查看效果，请尝试在单击按钮前后在密码字段中键入内容。</p>
​
<button onclick="myFunction()">设置为只读</button>
​
<script>
function myFunction() {
  document.getElementById("myPsw").readOnly = true;
}
</script>
​
</body>
</html>
​