<div class="m-form ovh">            <div class="hd">                <span class="fr" id="message">还能输入200个字</span>                我要说：                <select name="select" id="select">                                       <option value=http://www.mamicode.com/"12">北京</option>
                   <option value=http://www.mamicode.com/"13">上海</option>
                   <option value=http://www.mamicode.com/"14">深圳</option> </select>            </div>            <div class="bd">                <textarea name="textarea" id="textarea" cols="45" rows="5" onkeyup="checkLength()" maxlength="200"></textarea>                <p class="ovh">                    <input type="button" value=http://www.mamicode.com/"" class="btn-send fr" onclick="HandComment()"/>                    <span class="fr" style="display:none;">发送成功</span>                </p>            </div>        </div>

    /*动态计算能够输入的字数*/    function checkLength() {        var maxChars = 200;        if ($("#textarea").val().length > maxChars)            $("#textarea").val($("#textarea").val().substring(0, maxChars));        var curr = "还能输入" + (maxChars - $("#textarea").val().length) + "个字";        $("#message").html(curr.toString());    }