<div class="form-group">
	<div class="form-label">Ifsccode</div>
	<div class="form-row">
		<div class="flex_bd">
			<input type="text" id="Ifs" class="weui-input" datatype="*" nullmsg="请输入Ifsccode" errormsg="请输入Ifsccode" placeholder="请输入" value="">
		</div>
	</div>
</div>

var $input = $('#Ifs');
$input.on('input', function() {
	var $value = $input.val();
	if ($value){
	  $('#submit').removeClass('weui-btn_disabled');
	  $('#submit').removeAttr('disabled');
	}else{
	  $('#submit').addClass('weui-btn_disabled');
		$('#submit').attr('disabled','disabled');
	}
});