>[info] 借助这个服务能力来做一个简单的聊天功能（无心跳包支持）
>[danger]重点：此处前后端的心跳包都是被注释掉了的，即章节八的关键代码是需要注释掉的，不然会有问题，前端一小会就被踢下线了
前端代码：左侧uid2代码：
```
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Title</title>
</head>
<body>
<script>
ws = new WebSocket("ws://123.56.71.69:1234");
ws.onopen = function() {
console.log("连接成功");
var uid = '{"id":"uid2","msg":"hello,I`m uid2"}';
ws.send(uid);
console.log("给服务端发送一个Json字符串："+uid);
};
ws.onmessage = function(e) {
console.log("收到服务端的消息：" + e.data);
};
</script>
</body>
</html>
```
前端代码：右侧uid3代码：
```
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Title</title>
</head>
<body>
<script>
ws = new WebSocket("ws://123.56.71.69:1234");
ws.onopen = function() {
console.log("连接成功");
var uid = '{"id":"uid2","msg":"hello,I`m uid2"}';
ws.send(uid);
console.log("给服务端发送一个Json字符串："+uid);
};
ws.onmessage = function(e) {
console.log("收到服务端的消息：" + e.data);
};
</script>
</body>
</html>
```
### 两侧代码仅仅 这段不一样,一个uid2、uid3，这个就可以用一段代码，链接后面跟参数赋值即可
```
var uid = '{"id":"uid2","msg":"hello,Im uid2"}'
```
*****
服务端仅仅加了下面代码中的：
> sendMessageByUid($data['id'], $data['msg']);
```
$worker->onMessage = function($connection, $data)
{
global $worker;
$connection->lastMessageTime = time();
$data=json_decode($data,true);
// 判断当前客户端是否已经验证,既是否设置了uid
if(!isset($connection->uid))
{
// 没验证的话把第一个包当做uid（这里为了方便演示，没做真正的验证）
// $connection->uid = $connection->id;
$connection->uid = $data['id'];
/* 保存uid到connection的映射，这样可以方便的通过uid查找connection，
* 实现针对特定uid推送数据
*/
$worker->uidConnections[$connection->uid] = $connection;
$connection->send('Link_successful');
// sendMessageByUid($data['id'], $data['msg']);
return;
}else{
sendMessageByUid($data['id'], $data['msg']);
$connection->send('Already_Linked');
}
};
```