javascript - 当两个事件同时触发时如何解决promise？

Question

美好的一天。这是我的一个功能:

function LoginClient(user) {
return new Promise((resolve, reject) => {
    SteamClients[user.username].client.logOn({
        accountName: SteamClients[user.username].details.username,
        password: SteamClients[user.username].details.password,
        twoFactorCode: SteamTotp.generateAuthCode(SteamClients[user.username].details.shared_secret)
    })
    SteamClients[user.username].client.on('loggedOn', ()=> {
        Debug.emit('message', `Client logged in: ${SteamClients[user.username]}`);
    })
    SteamClients[user.username].client.on('webSession', (sid, cookies)=> {
        manager.setCookies(cookies);
        community.setCookies(cookies);
        Debug.emit('message', `Client logged into websession: ${SteamClients[user.username]}`);
    })
})
}

我想通过这个功能实现的是，当客户端登录并且网络 session 登录时，只有这样，promise 才会得到解决。原因是因为时机很重要。

Answer 1

一个快速的解决方案是为每个发生的事件维护 2 个 bool 值，并且仅在两者都为 true 时才调用 resolve(或者，更准确地说，当 other 中的 other 为 true 时事件处理程序)

function LoginClient(user) {
return new Promise((resolve, reject) => {
    SteamClients[user.username].client.logOn({
        accountName: SteamClients[user.username].details.username,
        password: SteamClients[user.username].details.password,
        twoFactorCode: SteamTotp.generateAuthCode(SteamClients[user.username].details.shared_secret)
    })
    var isLoggedOn = false;
    var hasWebSession = false;
    SteamClients[user.username].client.on('loggedOn', ()=> {
        Debug.emit('message', `Client logged in: ${SteamClients[user.username]}`);
        isLoggedOn = true;
        if(hasWebSession) resolve();
    })
    SteamClients[user.username].client.on('webSession', (sid, cookies)=> {
        manager.setCookies(cookies);
        community.setCookies(cookies);
        Debug.emit('message', `Client logged into websession: ${SteamClients[user.username]}`);
        hasWebSession = true;
        if(isLoggedOn) resolve();
    })
})
}