Node8 / Expresss 4如何获取特定响应标题属性的值?

我目前可以访问由json-server设置的响应标题属性“X-Total-Count”,但我不明白如何获取值…

在铬networking工具,被称为

响应头

HTTP/1.1 304 Not Modified X-Powered-By: Express X-Total-Count: 14 Access-Control-Expose-Headers: X-Total-Count, Link Link: <http://localhost:8080/api/users?_sort=lastName%7Casc&_page=1&_limit=5>; rel="first", <http://localhost:8080/api/users?_sort=lastName%7Casc&_page=2&_limit=5>; rel="next", <http://localhost:8080/api/users?_sort=lastName%7Casc&_page=3&_limit=5>; rel="last" X-Content-Type-Options: nosniff ETag: W/"4a2-UH/ZrGuCnz4JcDB1ZNEu7sRXZro" Date: Thu, 07 Dec 2017 07:42:32 GMT Connection: keep-alive 

我可以在我的server.js中访问它:

 apiRouter.render = (req, res) => { console.log('RES HEADERS: ', res.getHeaders()) console.log('RES TOTAL: ', res.getHeader('X-Total-Count')) console.log('RES LINK: ', res.getHeader('Link')) .... 

并获取日志显示:

 RES HEADERS: { 'x-powered-by': 'Express', 'x-total-count': { [Number: 14] __wrapped__: { shoppinglists: [Array], users: [Array] }, __actions__: [ [Object], [Object], [Object] ], __chain__: true, __index__: 0, __values__: undefined }, 'access-control-expose-headers': 'X-Total-Count, Link', link: '<http://localhost:8080/api/users?_sort=lastName%7Casc&_page=1&_limit=5>; rel="first", <http://localhost:8080/api/users?_sort=lastName%7Casc&_page=2&_limit=5>; rel="next", <http://localhost:8080/api/users?_sort=lastName%7Casc&_page=3&_limit=5>; rel="last"' } RES TOTAL: { [Number: 14] __wrapped__: { shoppinglists: [ [Object], ... [Object] ], users: [ [Object], ... [Object] ] }, __actions__: [ { func: [Function: get], args: [Object], thisArg: [Object] }, { func: [Function: orderBy], args: [Object], thisArg: [Object] }, { func: [Function: size], args: {}, thisArg: [Object] } ], __chain__: true, __index__: 0, __values__: undefined } 

但是我怎么能得到这个价值? :14 ….

感谢您的反馈

在json-server中,这个响应头的属性设置如下:

 // Slice result if (_end || _limit || _page) { res.setHeader('X-Total-Count', chain.size()) res.setHeader( 'Access-Control-Expose-Headers', `X-Total-Count${_page ? ', Link' : ''}` ) } 

res.getHeader('X-Total-Count')是一个函数…所以需要写:

  const total = res.getHeader('X-Total-Count') console.log('TOTAL: ', total). // => displaying 14