生日: <input type="datetime" id="myDatetime" readonly>

<p>点击按钮查看 datetime 字段是否只读</p>

<button onclick="myFunction()">点我</button>

<p id="demo"></p>

<script>

function myFunction() {

    var x = document.getElementById("myDatetime").readOnly;

    document.getElementById("demo").innerHTML = x;

}

</script>

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