$(function() {
            var btnSend = $("#<%=btnSend.ClientID %>");
            var txtContent = $("#<%=txtContent.ClientID%>");

            var jqSend = new jqSendSMS();

            //以下语句应该是点击btnSend之后,才执行？为什么一加载就自动执行？

             btnSend.click(jqSend.chkContent(txtContent,btnSend));

  });

         var jqSendSMS = function(){};

         jqSendSMS.prototype = {

             chkContent : function(chkTarget,DispTarget){

                if (chkTarget.val() == "") {
                    DispTip(DispTarget "发送内容为空，请输入", "bottomMiddle", "topMiddle");
                    return false;
                } else {
                    return true;
                }

             }

        }