伪聊天室实现记录

参考样式（css自定义聊天窗口样式）：http://www.downyi.com/downinfo/33029.html

功能描述：

1. 用户在微信公众号里发送内容，参与活动

2. 后台提供类似聊天室的窗口显示用户实时发布的内容

界面截图：

代码：

body {
  padding: 0;
  margin: 0;
  background: -moz-linear-gradient(-45deg, #183850 0, #183850 25%, #192c46 50%, #22254c 75%, #22254c 100%);
  background: -webkit-linear-gradient(-45deg, #183850 0, #183850 25%, #192c46 50%, #22254c 75%, #22254c 100%);
  background-repeat: no-repeat;
  background-attachment: fixed;
}

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  border-radius: 10px;
  background-color: rgba(25, 147, 147, 0.1);
}

::-webkit-scrollbar-thumb {
  border-radius: 10px;
  background-color: rgba(25, 147, 147, 0.2);
}

.chat-thread {
  margin: 24px auto 0 auto;
  padding: 0 20px 0 0;
  list-style: none;
  overflow-y: scroll;
  overflow-x: hidden;
}

.chat-thread .li {
  position: relative;
  clear: both;
  display: inline-block;
  padding: 16px 40px 16px 20px;
  margin: 0 0 20px 0;
  font: 16px/20px 'Noto Sans', sans-serif;
  border-radius: 10px;
  background-color: rgba(25, 147, 147, 0.2);
}

/* Chat - Avatar */
.chat-thread .img {
  width: 50px;
  height: 50px;
  border-radius: 50px;
  content: '';
  float:left;
  
}

/* Chat - Speech Bubble Arrow */
.chat-thread li:after {
  position: absolute;
  top: 15px;
  content: '';
  width: 0;
  height: 0;
  border-top: 15px solid rgba(25, 147, 147, 0.2);
}

.chat-thread li:nth-child(odd) {
  animation: show-chat-odd 0.15s 1 ease-in;
  -moz-animation: show-chat-odd 0.15s 1 ease-in;
  -webkit-animation: show-chat-odd 0.15s 1 ease-in;
  float: right;
  margin-right: 80px;
  color: #0AD5C1;
}

.chat-thread li:nth-child(odd):before {
  right: -80px;
}

.chat-thread li:nth-child(odd):after {
  border-right: 15px solid transparent;
  right: -15px;
}

.chat-thread li:nth-child(even) {
  animation: show-chat-even 0.15s 1 ease-in;
  -moz-animation: show-chat-even 0.15s 1 ease-in;
  -webkit-animation: show-chat-even 0.15s 1 ease-in;
  float: left;
  margin-left: 80px;
  color: #0EC879;
}

.chat-thread li:nth-child(even):before {
  left: -80px;
}

.chat-thread li:nth-child(even):after {
  border-left: 15px solid transparent;
  left: -15px;
}

.chat-window {
  position: fixed;
  bottom: 18px;
}

.chat-window-message {
  width: 100%;
  height: 48px;
  font: 32px/48px 'Noto Sans', sans-serif;
  background: none;
  color: #0AD5C1;
  border: 0;
  border-bottom: 1px solid rgba(25, 147, 147, 0.2);
  outline: none;
}

/* Small screens */
@media all and (max-width: 767px) {
  .chat-thread {
    width: 90%;
    height: 500px;
  }

  .chat-window {
    left: 5%;
    width: 90%;
  }
}
/* Medium and large screens */
@media all and (min-width: 768px) {
  .chat-thread {
    width: 70%;
    height: 500px;
  }

  .chat-window {
    left: 25%;
    width: 50%;
  }
}
@keyframes show-chat-even {
  0% {
    margin-left: -480px;
  }

  100% {
    margin-left: 0;
  }
}
@-moz-keyframes show-chat-even {
  0% {
    margin-left: -480px;
  }

  100% {
    margin-left: 0;
  }
}
@-webkit-keyframes show-chat-even {
  0% {
    margin-left: -480px;
  }

  100% {
    margin-left: 0;
  }
}
@keyframes show-chat-odd {
  0% {
    margin-right: -480px;
  }

  100% {
    margin-right: 0;
  }
}
@-moz-keyframes show-chat-odd {
  0% {
    margin-right: -480px;
  }

  100% {
    margin-right: 0;
  }
}
@-webkit-keyframes show-chat-odd {
  0% {
    margin-right: -480px;
  }

  100% {
    margin-right: 0;
  }
}
.credits{
  text-align:center;
  margin-top:35px;
  color: rgba(255, 255, 255, 0.35);
  font-family: 'Noto Sans', sans-serif;
}
.credits a{
  text-decoration:none;
  color: rgba(255, 255, 255, 0.35);
}

String sql = "SELECT c.*,u.nickName,u.headImg "
				+ "from wx_costomersendmessage c,bid_user u "
				+ "where c.openId=u.openId and c.id>"+maxId
				+" order by c.id Limit 0,"+limit;