文本框字數限制

    <div class="layui-form-item">
                <label class="layui-form-label"><span style="color: red">*</span>院校簡介：</label>
                <div class="layui-input-block">
                <textarea class="layui-textarea updateInst" style="height: 150px;"
                          id="academyDesc" name="academyDesc" lay-verify="required|describesVerify"
                          placeholder="請輸入院校簡介" onkeyup="checkLength(this,'200')"></textarea>
                    <span style="float: right;margin-right: 40px"><em><span
                            id="actual">0</span></em> / <em> <span>200</span></em></span>
                </div>
            </div>




<script>
    //判斷文本框字數
    function checkLength(which, count) {
        var maxChars = count;
        which.value = which.value.substring(0, maxChars);
        var curr = maxChars - which.value.length;
        var length = maxChars - curr;
        $("#actual").html(length)

    }
</script>