我遇到了一個嵌套的 for 循環(huán)，其中包含等待操作，如下所示：    async handleProjects (projects) {        for (let i = 0; i < projects.rows.length; i++) {            projects.rows[i].owner = await this.userProvider.serialize(projects.rows[i].owner);            for (let j = 0; j < projects.rows[i].collaborators.length; j++) {                const collaborator = await this.userProvider.serialize(projects.rows[i].collaborators[j].email);                if (collaborator) {                    projects.rows[i].collaborators[j].name = collaborator.name;                    delete projects.rows[i].collaborators[j].role;                }            }        }        return projects;    }1. 上面的代碼是按順序運行的嗎？2. 為了提高性能我想使用 promise.all 如下所示，但有些運行時間大致相同，有些時候 promise.all 甚至更長。我的錯誤在哪里？    async handleProject (projects) {        await Promise.all(projects.rows.map(async (row) => {            console.log(row);            row.owner = await this.userProvider.serialize(row.owner);            return await Promise.all(row.collaborators.map(async (collaborator) => {                const collaboratorObj = await this.userProvider.serialize(collaborator.email);                if (collaboratorObj) {                    collaborator.name = collaboratorObj.name;                    delete collaborator.role;                }            }));        }));        return projects;    }