Please wrap the field with a new element.
<form id="fmTest" method="post">
<div>
<input id="val1" name="val1" class="easyui-textbox">
</div>
<div>
<input id="val2" name="val2" class="easyui-textbox">
</div>
<div class="valData">
<input id="val3" name="val3" class="easyui-textbox valData">
</div>
<div class="valData">
<input id="val4" name="val4" class="easyui-textbox valData">
</div>
</form>
Call this line to get the specified field values.
const formData = $('.valData').find('.textbox-value').serialize();
console.log(formData);