问题描述
是否可以从嵌套函数中返回值?这是我到目前为止所得到的,但它不起作用。在我的代码中,我试图从 eventId
函数中返回 request.execute()
。我不知道我是否朝着正确的方向前进。任何帮助将不胜感激。
function insertDate(dateFormat) {
var eventId = "";
gapi.client.load('calendar','v3',function() { // load the calendar api (version 3)
var request = gapi.client.calendar.events.insert({
'calendarId': 'primary',// calendar ID
"sendNotifications": true,"resource": dateFormat // pass event details with api call
});
// handle the response from our api call
request.execute(function(resp) {
if(resp.status=='confirmed') {
eventId = resp.id
console.log("eventId in execute: " + eventId)
console.log("successfully inserted")
return eventId
} else {
console.log("Failed to insert")
}
console.log(resp);
console.log("2: " + resp.id);
});
return eventId
});
console.log("eventId on return: " + eventId)
return eventId
}
我将函数 insertDate(dateFormat)
放入循环中,并将我试图从 eventId
函数中获取的 request.execute()
添加到我的 eventIdArray
中,如下所示
var eventIdArray = [];
eventIdArray[i] = insertDate(dateFormat);
console.log("eventIdArray: " + eventIdArray[i]);
解决方法
你可以在promise中将insertDate中的代码包装起来,然后解析eventId,然后使用async/await来填充数组。您需要对代码稍作修改
更新你的代码
function insertDate(dateFormat) {
return new Promise((resolve,reject) => {
var eventId = "";
gapi.client.load('calendar','v3',function () { // load the calendar api (version 3)
var request = gapi.client.calendar.events.insert({
'calendarId': 'primary',// calendar ID
"sendNotifications": true,"resource": dateFormat // pass event details with api call
});
// handle the response from our api call
request.execute(function (resp) {
if (resp.status == 'confirmed') {
eventId = resp.id
console.log("eventId in execute: " + eventId)
console.log("successfully inserted")
// return eventId
resolve(eventId);
} else {
console.log("failed to insert");
resolve(-1); // just for indication -1 means not confirmed
//or reject(-1);
}
console.log(resp);
console.log("2: " + resp.id);
});
// return eventId
});
console.log("eventId on return: " + eventId)
});
}
然后将数组的填充包裹在async/await中,
注意
你必须把 async 放在这个循环包含的函数前面。我用 fillEventIdArray 作为一个例子来展示如何把 async 放在里面并使用 await 因为如果函数不包含 async 关键字,则无法使用 await
async fillEventIdArray(dateFormat) {
var eventIdArray = [];
//your for loop here and below is the code inside the for loop
const eventId = await insertDate(dateFormat)
eventIdArray.push(eventId);
console.log("eventIdArray: " + eventIdArray[eventIdArray.length - 1]);
}