如何監聽input中值的變化，該值是經過val()回填的，而且該input是hidden

<input type="hidden" name="CUSTOMER_ID" id="CUSTOMER_ID" value="<!--{$data.CUSTOMER_ID}-->" /> <input type="text" readonly id="CUSTOMER_NAME" name="CUSTOMER_NAME" value="<!--{$data.CUSTOMER_NAME}-->"/

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