/phone/write.skin.php 에 하기와 같이 넣으시면 됩니다.

[code]

<script>
const localAutoHyphen = (target) => {
 target.value = target.value
   .replace(/[^0-9]/g, '')
   .replace(/^(\d{2,3})(\d{3,4})(\d{4})$/, `$1-$2-$3`);
}

const phoneAutoHyphen2 = (target) => {
 target.value = target.value
  .replace(/[^0-9]/g, '')
  .replace(/^(\d{0,3})(\d{0,4})(\d{0,4})$/g, "$1-$2-$3").replace(/(\-{1,2})$/g, "");
}

</script>

[/code]

[code]

<div class="bo_w_tit write_div">
        <label for="wr_subject" class="sound_only">지역 전화번호<strong>필수</strong></label>        
        <div id="autosave_wrapper" class="write_div">
            <input type="text" oninput="localAutoHyphen(this)" id="wr_1" name="wr_1" class="frm_input full_input " value="<?php echo $wr_1;?>" maxlength="13" placeholder="지역 전화번호" autofocus  /> 
        </div>        
    </div>

    <div class="bo_w_tit write_div">
        <label for="wr_subject" class="sound_only">휴대  전화번호<strong>필수</strong></label>        
        <div id="autosave_wrapper" class="write_div">
            <input type="text" oninput="phoneAutoHyphen2(this)" id="wr_2" name="wr_2" class="frm_input full_input " value="<?php echo $wr_1;?>" maxlength="13" placeholder="휴대 전화번호" autofocus />
        </div>        
    </div>

[/code]