javascript - 对象中的数组在传递或 JSON.stringified 时为空
问题描述
我正在创建一个 Chrome 扩展程序,我在其中将一个对象(connectionStatus)从后台脚本发送到内容脚本。该对象包含一个数组 (supportedServiceContracts),当我在 content.js 中记录该对象时,该数组为空,即使我在发送它之前在 background.js 中记录它时可以看到它有数据。
这是为什么?
更新:
我还应该提到,如果我在对象上应用JSON.stringify()
,对象的数组部分会变空。见截图。
背景.js
chrome.browserAction.onClicked.addListener(function(tab) {
chrome.tabs.executeScript(tab.id, { file: "axios.min.js" });
chrome.tabs.executeScript(tab.id, { file: "content.js" });
var connectionStatus = {};
chrome.tabs.query({
active: true,
currentWindow: true
},
function(tabs) {
var tab = tabs[0];
var url = tab.url;
var urlString = new URL(url);
var childHSAId = urlString.searchParams.get("childhsaid");
if (childHSAId) {
var healthcareFacilityHSAId = urlString.searchParams.get("hsaid");
connectionStatus.healthcareFacilityHSAId = healthcareFacilityHSAId;
connectionStatus.childHSAId = childHSAId;
getConnectionStatusData(childHSAId);
} else {
var healthcareFacilityHSAId = urlString.searchParams.get("hsaId");
connectionStatus.healthcareFacilityHSAId = healthcareFacilityHSAId;
getConnectionStatusData(healthcareFacilityHSAId);
}
});
async function getConnectionStatusData(logicalAddress) {
let serviceDomains = await axios.get('http://api.ntjp.se/coop/api/v1/serviceDomains.json', {
params: {
namespace: "crm:scheduling"
}
});
serviceDomainId = serviceDomains.data[0].id;
let connectionPoints = await axios.get('http://api.ntjp.se/coop/api/v1/connectionPoints.json', {
params: {
platform: "NTJP",
environment: "PROD"
}
});
connectionPointId = connectionPoints.data[0].id;
var d = new Date(connectionPoints.data[0].snapshotTime);
var options = { hour: '2-digit', minute:'2-digit' };
snapshotTime = d.toLocaleDateString('se-SE', options)
connectionStatus.snapshotTime = snapshotTime;
let logicalAddresss = await axios.get('http://api.ntjp.se/coop/api/v1/logicalAddresss.json', {
params: {
logicalAdress: logicalAddress,
serviceConsumerHSAId: "SE2321000016-92V4",
connectionPointId: connectionPointId
}
});
if (logicalAddresss.data === undefined || logicalAddresss.data.length == 0) {
connectionStatus.errorMessage = "HSA-id " + logicalAddress + " är inte registrerat i Ineras API för Etablerad samverkan i vården. API:t uppdaterades med data från Nationella tjänsteplattformens tjänstekatalog vid " + snapshotTime + ".";
sendMessage();
return;
} else {
logicalAddressId = logicalAddresss.data[0].id;
}
let serviceConsumers = await axios.get('http://api.ntjp.se/coop/api/v1/serviceConsumers.json', {
params: {
connectionPointId: connectionPointId,
logicalAddressId: logicalAddressId
}
});
consumer = serviceConsumers.data.filter(obj => {
return obj.hsaId === "SE2321000016-92V4"
});
serviceConsumerId = consumer[0].id;
let cooperations = await axios.get('http://api.ntjp.se/coop/api/v1/cooperations.json', {
params: {
connectionPointId: connectionPointId,
logicalAddressId: logicalAddressId,
serviceDomainId: serviceDomainId,
serviceConsumerId: serviceConsumerId,
include: "serviceContract"
}
});
var supportedServiceContracts = [];
cooperations.data.forEach(function(cooperation) {
axios.get('http://api.ntjp.se/coop/api/v1/serviceProducers.json', {
params: {
connectionPointId: connectionPointId,
logicalAddressId: logicalAddressId,
serviceDomainId: serviceDomainId,
serviceConsumerId: serviceConsumerId,
serviceContractId: cooperation.serviceContract.id
}
}).then(response => {
supportedServiceContracts.push({serviceContract: cooperation.serviceContract.namespace, serviceProducerDescription: response.data[0].description, serviceProducerHSAId: response.data[0].hsaId});
});
});
connectionStatus.supportedServiceContracts = supportedServiceContracts;
sendMessage();
function sendMessage() {
console.log(connectionStatus); // The array supportedServiceContracts has data
console.log(JSON.stringify(connectionStatus)); // The array supportedServiceContracts has NO data
chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
chrome.tabs.sendMessage(tabs[0].id, connectionStatus);
});
};
}
});
内容.js
chrome.runtime.onMessage.addListener(
function(request, sender, sendResponse) {
console.log(request); // The array supportedServiceContracts has NO data
});
解决方案
- 使用Promise.all()完成所有网络请求后发送消息- 浏览器将自动将所有请求排入队列并一次发出一堆,还有 JS 库允许自定义 Promise.all 中的并行作业数量。
- 使用
tab
browserAction.onClicked 的参数而不是重新查询活动选项卡,这既多余又错误 - 用户可能会在您的代码运行时切换选项卡 - 使用WebExtension polyfill以简单的方式通过 Promise/async 调用 API
browser.browserAction.onClicked.addListener(async tab => {
// enqueue without waiting so we don't block the subsequent async code
const contentScriptReady = Promise.all([
browser.tabs.executeScript(tab.id, {file: "axios.min.js"}),
browser.tabs.executeScript(tab.id, {file: "content.js"}),
]);
const connectionStatus = {};
/* snipped */
connectionStatus.supportedServiceContracts = await Promise.all(
cooperations.data.map(cooperation =>
axios.get('http://api.ntjp.se/coop/api/v1/serviceProducers.json', {
params: {
connectionPointId,
logicalAddressId,
serviceDomainId,
serviceConsumerId,
serviceContractId: cooperation.serviceContract.id,
},
}).then(response => ({
serviceContract: cooperation.serviceContract.namespace,
serviceProducerDescription: response.data[0].description,
serviceProducerHSAId: response.data[0].hsaId,
}))
)
);
await contentScriptReady;
browser.tabs.sendMessage(tab.id, connectionStatus);
});
PS 尝试修改您的代码,以便使用 Promise.all 并行调用多个 axios.get 请求,而不是等待每个请求按顺序完成。
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