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I recently read some articles and started to use async to handle asynchronous code. It is much easier to use than the previous asynchronous callbacks. However, I found that there seems to be a problem with my writing method. I posted it and everyone can help me correct it....

(async function(){
    let username = req.body.username;
    let password = req.body.password;
    // 查找當(dāng)前用戶名是否已經(jīng)注冊(cè)(返回值為數(shù)組,沒有結(jié)果則為空數(shù)組,長(zhǎng)度為0)
    let userIsRegisted = await user.findByName(username);
    // 因?yàn)橛脩裘奈ㄒ恍?可以使用==1或者!=0兩種方式判斷
    if(userIsRegisted.length!=0){
        res.send('當(dāng)前用戶已注冊(cè)');
        return;
    }
    // 密碼加密
    let hashPassword = crypto.createHash('sha1').update(password).digest('hex');
    let obj = {
        username:username,
        password:hashPassword
    }
    // 添加新用戶
    await user.create(obj);
    // 設(shè)置session
    req.session.username=username;
    req.session.loged = true;
    res.send('注冊(cè)成功');
 })();
    

Regardless of the logic of writing, this is the calling method, right? It always feels weird that I need to write an immediate execution function...