维基百科API

Question

检索提取所以我得到一个JSON响应，看起来像这样：

{ 
"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." 
     } 
    } 
} 
} 

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

我只想获得页面的提取物。麻烦的是我不知道pageid，直到我得到响应，所以不能调用提取。

要获取这个例子中，提取物我必须做的：

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

所以我试图通过使一个变量加入到这样的查询来获取页面ID的值：

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

但作为变量的pageid上来，因为这一直没有successeful：

"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." 
} 

我也要使用JavaScript和jQuery的不是等

Answer 1

试试这个小提琴：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); 

Answer 2

你可以这样提取的pageid：

var pageid = Object.keys(suggestionData.query.pages)[0]; 

那么这应该工作：

console.log(suggestionData.query.pages[pageid].extract"); 

Answer 3

您可以使用Object.keys(jsonObj);找出钥匙。 在你的情况下，var pageid是一个json对象。要访问值，看看这个线程（get keys of json-object in JavaScript）

在简短的回答是

for key in pageid 
    content= pageid[key] 
    extract = content.extract