javascript - 返回循环中的每个响应

Question

我有一个使用 axios 的函数，我根据为特定用户返回的 id 数量删除多条记录。

async function DeleteAllRecords (emailAddress) {
    try {
        var accessToken = await setup.getAccessToken(emailAddress);
        var userId = await user.getUserId(emailAddress);
        var recordIds = await getAllRecordID(emailAddress);
        console.log(`Deleting all records for `+emailAddress+``);
        for (const rId of recordIds) {
            const response = await axios.delete(`${process.env.API_URL}/`+userId+`/records/`+recordIds+``, {'headers': {Authorization: 'Bearer '+accessToken+''}});
        }
        return response;
    }
    catch(e) {
        console.error(``+emailAddress+` produced the Record Delete Error = ` + e);
    }
}

这不起作用，我不确定为什么。我想查看每个 axios.delete 调用的响应，但我不确定如何获得它。目前其返回的响应未定义。

Answer 1

为什么你的代码不起作用:

1. const response在循环作用域内声明，并且不能在该闭包之外访问。
2. 即使它是在循环之前定义的(使用 let const )并在循环内部分配，您仍然只能返回最后一个响应。

您可以将每个响应推送到一个数组 ( responses )，并返回该数组:

async function DeleteAllRecords (emailAddress) {
    try {
        var accessToken = await setup.getAccessToken(emailAddress);
        var userId = await user.getUserId(emailAddress);
        var recordIds = await getAllRecordID(emailAddress);
        console.log(`Deleting all records for `+emailAddress+``);
        const responses = [];
        for (const rId of recordIds) {
            const response = await axios.delete(`${process.env.API_URL}/`+userId+`/records/`+recordIds+``, {'headers': {Authorization: 'Bearer '+accessToken+''}});
            responses.push(response);
        }
        return responses;
    }
    catch(e) {
        console.error(``+emailAddress+` produced the Record Delete Error = ` + e);
    }
}

但是，在这种情况下，多个并行请求会更好，因为您实际上不需要一一删除。我会使用 Array.map()迭代 recordIds数组，并为每个数组返回一个 promise ，然后使用 Promise.all() 等待所有响应，它也会返回一组响应:

async function DeleteAllRecords (emailAddress) {
    try {
        var accessToken = await setup.getAccessToken(emailAddress);
        var userId = await user.getUserId(emailAddress);
        var recordIds = await getAllRecordID(emailAddress);
        console.log(`Deleting all records for `+emailAddress+``);
        
        return Promise.all(recordIds.map(rId =>  axios.delete(`${process.env.API_URL}/`+userId+`/records/`+recordIds+``, {'headers': {Authorization: 'Bearer '+accessToken+''}})));
    }
    catch(e) {
        console.error(``+emailAddress+` produced the Record Delete Error = ` + e);
    }
}