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## websocket js 客户端
### 前言
> ws地址: ws://127.0.0.1:20201/admin/ws?token=sdsdsdsdsdsdsdsdsdsdsdsdssdsd
> 由于中间模拟校验了token参数，
> 以下代码保存为 `ws.html` 在浏览器直接访问即可连接服务端
> ws服务默认未开启，
<!DOCTYPE html>
< html lang = "en" >
< head >
< meta charset = "UTF-8" >
< title > websocket client</ title >
< script src = "http://libs.baidu.com/jquery/2.1.4/jquery.min.js" ></ script >
</ head >
< body >
< div >
< h3 > websocket client 测试代码</ h3 >
< label > 发送消息：</ label >
< br />
< textarea id = "sendmsg" >
</ textarea >
< hr />
< label > 接受到的消息 ： </ label >
< br />
< textarea id = "receivedmsg" >
</ textarea >
< button name = "btn1" onclick = "send_msg()" > 发送</ button >
</ div >
< script >
var wsServer_ip = 'ws://127.0.0.1:20201/admin/ws?token=sdsdsdsdsdsdsdsdsdsdsdsdsdsdsdsd' ;
var websocket = new WebSocket ( wsServer_ip );
websocket . onopen = function ( evt ) {
console . log ( "Connected to WebSocket server." );
console . log ( evt )
};
websocket . onmessage = function ( evt ) {
console . log ( evt )
console . log ( '收到 data from server: ' + evt . data );
$ ( "#receivedmsg" ). text ( evt . data )
};
websocket . onclose = function ( evt ) {
console . log ( "与服务器连接断开" );
console . log ( evt );
alert ( "close事件发生" )
};
websocket . onerror = function ( evt , e ) {
console . log ( e );
console . log ( 'Error occured: ' + evt . data );
alert ( "error事件发生" )
};
function send_msg () {
//发送消息
$user_send_msg = $ ( "#sendmsg" ). val ()
console . log ( "发送消息：" + $user_send_msg )
websocket . send ( $user_send_msg )
}
</ script >
</ body >
</ html >
```
