通过实现webSocket.WebSocketRequestOptions接口封装了一个Option对象

import webSocket from '@ohos.net.webSocket'; 
import { BusinessError } from '@ohos.base'; 
let ws = webSocket.createWebSocket(); 
let header: HashMap<string, string> = new HashMap(); 
header.set("key", "value") 
header.set("key2", "value2") 
let url = "ws://" 
ws.connect(url, header as webSocket.WebSocketRequestOptions, (err: BusinessError, value: Object) => { 
    if (!err) { 
    console.log("connect success"); 
    } else { 
        console.log("connect fail, err:" + JSON.stringify(err)) 
    } 
});