Question

我正在NodeJS

上循环使用forEach获取数据

var detail = await orderModels.get_rab_workitem_v2(order_id)
        detail.forEach(keys => {
                var beneficiary_name = keys.cp_name
                var beneficiary_account = keys.bank_account_number
                var beneficiary_bank = keys.iris_code
                var beneficiary_email = keys.email
        })

问题是，如何从forEach循环beneficiary_name内部调用NodeJS变量？

我的意思是我想在forEach循环之外调用beneficiary_name变量，例如：

var detail = await orderModels.get_rab_workitem_v2(order_id)
            detail.forEach(keys => {
                    var beneficiary_name = keys.cp_name
                    var beneficiary_account = keys.bank_account_number
                    var beneficiary_bank = keys.iris_code
                    var beneficiary_email = keys.email
            })
var test = beneficiary_name

如何？

Answer 1

当前看来您想将最后分配的值分配给beneficiary_name。

因此，基本上，您可以跳过forEach并仅从最后一个索引中读取值：

var detail = await orderModels.get_rab_workitem_v2(order_id);
var test = detail[detail.length - 1].cp_name;

但是，如果您想要一个key.cp_name数组，则可以使用detail.map(keys => keys.cp_name)，也可以在正确的范围内定义一个数组并推送数据：

var beneficiary_name_list = [];
var detail = await orderModels.get_rab_workitem_v2(order_id)
            detail.forEach(keys => {
                    var beneficiary_name = keys.cp_name
                    var beneficiary_account = keys.bank_account_number
                    var beneficiary_bank = keys.iris_code
                    var beneficiary_email = keys.email

                    beneficiary_name_list.push(keys.cp_name);
            })
var test = beneficiary_name_list

Answer 2

在循环外声明变量，然后在循环内设置变量，将允许您的test Var引用受益变量...但是，循环会将受益变量设置为detail数组中的最后一个元素。如果您打算在detail数组的每次迭代中对每个受益人变量执行某项操作，那么我建议您在循环内执行该逻辑-出于上述考虑，不要在循环外进行。

var beneficiary_name
var beneficiary_account
var beneficiary_bank
var beneficiary_email

var detail = await orderModels.get_rab_workitem_v2(order_id)
detail.forEach(keys => {
        beneficiary_name = keys.cp_name
        beneficiary_account = keys.bank_account_number
        beneficiary_bank = keys.iris_code
        beneficiary_email = keys.email
})

var test = beneficiary_name

如何从forEach

2 个答案: