1 <div class="remark_edit J_Remark_Edit"> 2     <div class="tip-body"> 3         <h4>备注信息:</h4> 4         <textarea cols="44">请输入备注信息</textarea> 5     </div> 6     <div class="tip-ctrl"> 7         <a href="http://www.mamicode.com/#" class="btn-s-red J_Remark_Yes">确定</a> 8         <a href="http://www.mamicode.com/#" class="btn-s-gray J_Remark_Cancel">取消</a> 9         <span>10         还能输入<strong class="maxNum" style="color: rgb(51, 51, 51);">137</strong>个字11         </span>12     </div>13 </div>

var Remark = {        init:function(){            this.editRemark = $(‘.J_Remark_Edit‘);            this.bind();        },        bind:function(){            var self = this;            var $text = self.editRemark.one(‘textarea‘),                bSend = false;            //事件绑定, 判断字符输入            $text.on(‘keyup‘,function(){                bSend = self.confine();            });            $text.on(‘focus‘,function(){                bSend = self.confine();            });            $text.on(‘change‘,function(){                bSend = self.confine();            });            self.editRemark.all(‘.J_Remark_Yes‘).on(‘click‘,function(e){                e.preventDefault();                if(bSend){                    var msg = S.trim($text.val());                    // send msg;                }else{                    alert(‘内容不能超过140个字!‘);                }            })        },        //输入字符限制        confine : function(){            var self = this;            var $text = self.editRemark.one(‘textarea‘),                $maxNum = self.editRemark.one(‘.maxNum‘),                maxNum = 140,                bSend = false;            var iLen = $text.val().length;            $maxNum.html(maxNum - Math.floor(iLen));
　　　　　　　　//最重要的就是这一句            if(maxNum - Math.floor(iLen) >= 0){                $maxNum.css({"color":"#333"});                bSend = true;            }else{                $maxNum.css({"color":"#d31022"});                bSend = false;            }            return bSend;        }    }    Remark.init();