tryjsref_number_disabled3 在线代码实例

 <input type="number" id="myNumber" value="2"><br><br>
<button onclick="disableBtn()">禁用 Number 字段</button>
<button onclick="undisableBtn()">启用 Number 字段</button>
<script>
function disableBtn() {
    document.getElementById("myNumber").disabled = true;
}
function undisableBtn() {
    document.getElementById("myNumber").disabled = false;
}
</script>