发起请求 uni.request 上传、下载 uni.uploadFileuni.downloadFile WebSocket uni.connectSocketuni.onSocketOpenuni.onSocketErroruni.sendSocketMessageuni.onSocketMessageuni.closeSocketuni.onSocketClose SocketTask SocketTask.onMessageSocketTask.sendSocketTask.closeSocketTask.onOpenSocketTask.onCloseSocketTask.onError mDNSUDP 通信