인풋 maxlengh 가 먹히지 않아 문의드립니다. 채택완료

</p>

<p><table style="text-align: center;

    margin-left: auto;

    margin-right: auto;">

 <input type="tel" readonly="readonly" maxlength="4" min="4" id="exp" name="wr_3" value="<?php echo $wr_3 ?>" size="20" placeholder="전화번호 마지막 4자리" style="font-family: 'Exo 2', sans-serif; font-size: 50px; text-align: center;" required ></br></br>

   

<tr>

   <td> <input type="button" onfocus="this.blur()" value=" 1 " onClick="enter_exp(document.fwrite.exp,' 1 ')" class="ddd btn-4" readonly="readonly"></td>

    <td> <input type="button" onfocus="this.blur()" value=" 2 " onClick="enter_exp(document.fwrite.exp,' 2 ')" class="ddd btn-4" readonly="readonly"></td>

    <td><input type="button" onfocus="this.blur()" value=" 3 " onClick="enter_exp(document.fwrite.exp,' 3 ')" class="ddd btn-4" readonly="readonly"></td>

    <td><input type="button" onfocus="this.blur()" value=" ← " onClick="enter_exp(document.fwrite.exp,' ← ')" class="ddd btn-4" readonly="readonly"></td>

</tr>    </p>

<p><tr>

    <td><input type="button" onfocus="this.blur()" value=" 4 " onClick="enter_exp(document.fwrite.exp,' 4 ')" class="ddd btn-4" readonly="readonly"></td>

    <td><input type="button" onfocus="this.blur()" value=" 5 " onClick="enter_exp(document.fwrite.exp,' 5 ')" class="ddd btn-4" readonly="readonly"></td>

    <td><input type="button" onfocus="this.blur()" value=" 6 " onClick="enter_exp(document.fwrite.exp,' 6 ')" class="ddd btn-4" readonly="readonly"></td>

  <td rowspan="3"><input type = "button" onfocus="this.blur()" value= " C " onClick="clear_exp(document.fwrite.exp)" class="btn-4"  style="width:70px; height: 216px; font-size: 30px;"></td>

</tr>

<tr>

    <td><input type="button" onfocus="this.blur()" value=" 7 " onClick="enter_exp(document.fwrite.exp,' 7 ')" class="ddd btn-4" readonly="readonly"></td>

    <td> <input type="button" onfocus="this.blur()" value=" 8 " onClick="enter_exp(document.fwrite.exp,' 8 ')" class="ddd btn-4" readonly="readonly"></td>

    <td> <input type="button" onfocus="this.blur()" value=" 9 " onClick="enter_exp(document.fwrite.exp,' 9 ')" class="ddd btn-4" readonly="readonly"></td>

</tr>

<tr>

  <td colspan="3"><input type="button" onfocus="this.blur()" value=" 0 " onClick="enter_exp(document.fwrite.exp,' 0 ')" class="btn-4"  style=" width:216px;   height: 70px; font-size: 30px;" readonly="readonly"></td>

    

    </tr>

</table></p>

<p> </p>

<p><script LANGUAGE="JavaScript"></p>

<p>function enter_exp(p,str){

if(str==" ← ") p.value = p.value.substring(0, p.value.length-3);

else p.value+=str;

}

function clear_exp(p){

p.value=""

}</p>

<p></script></p>

<p>