javascript - 从 Wikipedia API 检索摘录

Question

这个问题已经有答案了:

Accessing an object property with a dynamically-computed name (19 个回答)

已关闭 6 年前。

所以我得到一个 JSON 响应，如下所示:

{
"batchcomplete": "",
"query": {
    "pages": {
        "97646": {
            "pageid": 97646,
            "ns": 0,
            "title": "Die Hard",
            "extract": "Die Hard is a 1988 American action film directed by John McTiernan and written by Steven E. de Souza and Jeb Stuart. It follows off-duty New York City Police Department officer John McClane (Bruce Willis) as he takes on a group of highly organized criminals led by Hans Gruber (Alan Rickman), who perform a heist in a Los Angeles skyscraper under the guise of a terrorist attack using hostages, including McClane's wife Holly (Bonnie Bedelia), to keep the police at bay.\nIt is based on Roderick Thorp's 1979 novel Nothing Lasts Forever, the sequel to 1966's The Detective, which was adapted into a 1968 film of the same name that starred Frank Sinatra. Fox was therefore contractually obligated to offer Sinatra the lead role in Die Hard, but he turned it down. The studio then pitched the film to Arnold Schwarzenegger as a sequel to his 1985 action film Commando; he turned it down, as well, and the studio finally and reluctantly gave it to Willis, then known primarily as a comedic television actor.\nMade for $28 million, Die Hard grossed over $140 million theatrically worldwide, and was given a positive reception from critics. The film turned Willis into an action star, became a metonym for an action film in which a lone hero fights overwhelming odds, and has been named one of the best action movies ever made. The film also ranks #29 on Empire magazine's 2008 list of the 500 greatest movies of all time. The film's success spawned the Die Hard franchise, which includes four sequels (Die Hard 2, Die Hard with a Vengeance, Live Free or Die Hard and A Good Day to Die Hard), video games, and a comic book."
        }
    }
}
}

这是链接:https://en.wikipedia.org/w/api.php?format=jsonfm&action=query&prop=extracts&exintro=&explaintext=&titles=Die%20Hard

我只想获取页面的摘录。问题是在收到响应之前我不知道 pageid，因此无法调用提取。

要获取此示例的摘录，我必须执行以下操作:

var data = JSON.parse(this.response);
console.log(suggestionData.query.pages.97646.extract);

因此，我尝试通过将页面 id 设为变量来添加到查询中来获取页面 id 的值，如下所示:

var data = JSON.parse(this.response);
var pageid = [suggestionData.query.pages[0];
console.log(suggestionData.query.pages. + pageid +.extract);

但这并没有成功，因为变量 pageid 出现为:

"97646": {
            "pageid": 97646,
            "ns": 0,
            "title": "Die Hard",
            "extract": "Die Hard is a 1988 American action film directed by John McTiernan and written by Steven E. de Souza and Jeb Stuart. It follows off-duty New York City Police Department officer John McClane (Bruce Willis) as he takes on a group of highly organized criminals led by Hans Gruber (Alan Rickman), who perform a heist in a Los Angeles skyscraper under the guise of a terrorist attack using hostages, including McClane's wife Holly (Bonnie Bedelia), to keep the police at bay.\nIt is based on Roderick Thorp's 1979 novel Nothing Lasts Forever, the sequel to 1966's The Detective, which was adapted into a 1968 film of the same name that starred Frank Sinatra. Fox was therefore contractually obligated to offer Sinatra the lead role in Die Hard, but he turned it down. The studio then pitched the film to Arnold Schwarzenegger as a sequel to his 1985 action film Commando; he turned it down, as well, and the studio finally and reluctantly gave it to Willis, then known primarily as a comedic television actor.\nMade for $28 million, Die Hard grossed over $140 million theatrically worldwide, and was given a positive reception from critics. The film turned Willis into an action star, became a metonym for an action film in which a lone hero fights overwhelming odds, and has been named one of the best action movies ever made. The film also ranks #29 on Empire magazine's 2008 list of the 500 greatest movies of all time. The film's success spawned the Die Hard franchise, which includes four sequels (Die Hard 2, Die Hard with a Vengeance, Live Free or Die Hard and A Good Day to Die Hard), video games, and a comic book."
}

我也想使用 javascript 而不是 jQuery 等。

Answer 1

试试这个 fiddle :https://jsfiddle.net/u9dnm70b/

var response = '{"batchcomplete": "","query": {"pages": {"97646": {"extract": "abcd"    }}}}';
var suggestionData = JSON.parse(response);
var pageid = Object.keys(suggestionData.query.pages)[0];
console.log(suggestionData.query.pages[pageid].extract);