输入框限制字数数量_山沟沟里的娃的博客

<div class="srk">
   <input type="text" placeholder='请输入问题' id="wby0" data-max='100' maxLength='100' onkeyup="wby(0)" />
    <div class="tishiNum"><span id='titleNum'>0</span>/100</div>
</div>

<script type="text/javascript">
   function wby(e){
        var length = $('#wby'+e).val().length;
        if(length>$('#wby'+e).data('max')){
            alert('字数请在100字以内')
        }else{
            $('#wby'+e).closest('.srk').find('#titleNum').text(length)
        }
    }
</script>
<div class="srk">
   <input type="text"