​x
 
<!DOCTYPE html>
<html>
<body>
​
<input type="month" id="myMonth" readonly>
​
<p>单击按钮可查看月份字段是否为只读。</p>
​
<button onclick="myFunction()">试一试</button>
​
<p><b>注意：</b>type="month" 的输入元素在 Firefox 中不会显示为任何日期字段/日历。</p>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var x = document.getElementById("myMonth").readOnly;
  document.getElementById("demo").innerHTML = x;
}
</script>
​
</body>
</html>
​