如果有人可以帮助我,那将是一个救生员!!
(我正在使用PARSE)
基本上这个解析工作试图做的是 1)查询名为channel的类的所有对象 2)循环遍历从查询返回的“Results”数组中的每个对象 3)拨打一个返回JSON字符串的Google API 4)解析JSON并保存名为Videos
的对象的新实例问题是我不断收到错误: 失败:未捕获的SyntaxError:意外的令牌T in:1 失败:未捕获的SyntaxError:输入的意外结束:0
Parse.Cloud.job("TestFunction", function(request, status) {
var query = new Parse.Query("Channel");
query.find ({
success: function (results) {
var httpRaw;
for (var i = 0; i < results.length; i++) {
var channel_id = results[i].get("channel_id");
Parse.Cloud.httpRequest({
url: 'https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=UCKy1dAqELo0zrOtPkf0eTMw&maxResults=50&order=viewCount&type=video&key=AIzaSyCLGCJOPU8VVj7daoh5HwXZASnmGoc4ylo',
success: function (httpResponse) {
httpRaw = httpResponse.text;
},
error: function (httpResponse) {
console.error('Request failed with response code ' + httpResponse.status);
}
});
var json = JSON.parse(httpRaw);
for (var z = 0; z < json.items.length ; z++){
var video = new Parse.Object("Video");
video.set("video_id", json.items[z].id.videoId.toString());
video.set("video_title", json.items[z].snippet.title.toString());
video.set("video_description", json.items[z].snippet.description.toString());
video.set("video_thumbnail", json.items[z].snippet.thumbnails.medium.url.toString());
video.set("date_published", json.items[z].snippet.publishedAt.toString());
var relation = video.relation("parent_channel");
relation.add(results[i]);
video.save();
}
}
},
error: function() {
}
});
});
答案 0 :(得分:4)
我猜测原因是JSON.parse()
。 HTTP请求在云代码中是非阻塞的(通常在JavaScript中无处不在),因此在JSON.parse()
设置之前评估httpRaw
。
至少,您需要将parse()调用和以下循环移动到HTTP请求的成功处理程序中,以便它们等到您有一个有效的响应。我建议使用Promise而不是成功/错误回调。
以下是我将如何处理它(警告:未经测试的代码如下......)
Parse.Cloud.job("TestFunction", function(request, status) {
var query = new Parse.Query("Channel");
query.find().then(function(results) {
var requests = [];
for (var i = 0; i < results.length; i++) {
var channel_id = results[i].get("channel_id");
requests.push(Parse.Cloud.httpRequest({
url: 'https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=UCKy1dAqELo0zrOtPkf0eTMw&maxResults=50&order=viewCount&type=video&key=AIzaSyCLGCJOPU8VVj7daoh5HwXZASnmGoc4ylo'
}));
}
return Parse.Promise.when(requests);
}).then(function(results) {
var videos = [];
for(var i = 0; i < results.length; i++) {
var httpRaw = results[i].text;
var json = JSON.parse(httpRaw);
for (var z = 0; z < json.items.length ; z++){
var video = new Parse.Object("Video");
video.set("video_id", json.items[z].id.videoId.toString());
video.set("video_title", json.items[z].snippet.title.toString());
video.set("video_description", json.items[z].snippet.description.toString());
video.set("video_thumbnail", json.items[z].snippet.thumbnails.medium.url.toString());
video.set("date_published", json.items[z].snippet.publishedAt.toString());
var relation = video.relation("parent_channel");
relation.add(results[i]);
videos.push(video);
}
}
return Parse.Object.saveAll(videos);
});
});