到一个网站，想把里面头像是女的图页下载下来，找到face++的人脸api ，识别还可以，下面是代码：

// defer.js
function defer() {
    var resolve, reject;
    var promise = new Promise(function() {
        resolve = arguments[0];
        reject = arguments[1];
    });
    return {
        resolve: resolve,
        reject: reject,
        promise: promise
    };
}

module.exports = defer;
// 以上是 defer 文件。

// 下面是 request文件
const _ = require('ramda'),
    request = require('superagent'),
    fs = require("fs"),
    Promise = require("bluebird"),
    Defer = require("./defer");

let index = _.range(1, 2000);

// 网址你自己找找，我就不提供了
let getUrl = x => `http://www.cctv.gov.cn/Per_Pic/PerPic_${x}.jpg`;
let face_key = "ca8922f075a28c43ef55ef36c7e619ad";
let face_secret = "_Q_I3Bq83AnUOfRNZod7RUUokEXFfigd"
let face_url = "https://apicn.faceplusplus.com/v2/detection/detect"

let detection = (url) => {
    let defer = Defer();
    request.get(face_url)
        .query({ api_key: face_key })
        .query({ api_secret: face_secret })
        .query({ url: url })
        .query({ attribute: "gender" })
        .accept("json")
        .end((err, res) => {
            if (err || !res.ok) {
                defer.reject(err);
            } else {
                defer.resolve(res.body);
            }
        })

    return defer.promise;
}

let download = url => {
    console.log(`start downloading : female : ${url}`);
    let defer = Defer();
    request
        .get(url)
        .redirects(0)
        .end((err, res) => {
            if (err || !res.ok || !Object.keys(res.body).length) {
                defer.reject("err");
            } else {
                fs.writeFile(_.last(url.split("/")), res.body, (e) => {
                    if (e) {
                        defer.reject(e);
                    } else {
                        console.log(`end downloaded : female : ${url}`);
                        defer.resolve(null);
                    }
                });
            }
        })
    return defer.promise;
}

let getFemale = url =>
    detection(url)
	  .then(
		  x => {
			  let result = _.pipe(_.prop("face"),
				  _.head,
				  _.prop("attribute"),
				  _.prop("gender"),
				  _.prop("value"))(x) === "Female";
  
			  if (result) {
				  return url;
			  } else {
				  return Promise.reject("err");
			  }
		  })
	  .then(download)
	  .catch(_ => console.log("male"))
	  
Promise.mapSeries(index, (item, index, length) => _.pipe(getUrl, getFemale)(item)).then(_ => console.log("ok")).catch(_ => console.log('err'));

遍历网址没有做，毕竟不需要那么复杂。