JS SDK

 var expressIm = new ExpressIM({
	appkey: '您的app key',
	signature: '您的签名',
	usernum: '用户编号',
	onConnected: function () {
	//连接成功			
	},
	onDisconnected: function () {               
	    //连接断开
	},
	onConnectFailed: function (e) {
	      //连接失败
	      console.log(e);
	}
}) 

 expressIm.subscribe({
    appkey: '您的app key',
    channel: 'Channel Id',
    onMessage: function (e) {
          //接收到消息
         console.log(e);
    }
}) 

 expressIm.publish({
    appkey: '您的app key',
    channel: 'Channel Id',
    message: '要发送的消息内容'
})