Question

我有一个WordPress中的url列表，需要通过循环以有效的方式对其进行排序。

var urlList = [
  {
    "URL": "https://example.com/cat1/aa/bb/cc",
    "Last crawled": "Jun 23, 2019"
  },
  {
    "URL": "https://example.com/cat2/aa",
    "Last crawled": "Jun 23, 2019"
  },
  {
    "URL": "https://example.com/cat1/aa/bb/cc/dd/ee",
    "Last crawled": "Jun 23, 2019"
  },
  {
    "URL": "https://example.com/cat3/aa/bb/cc/",
    "Last crawled": "Jun 23, 2019"
  },
  {
    "URL": "https://example.com/cat2/aa/bb",
    "Last crawled": "Jun 23, 2019"
  },
  {
    "URL": "https://example.com/cat1/aa/bb",
    "Last crawled": "Jun 23, 2019"
  }
]

urlList.forEach(function(item) {
    var myUrl = item.URL.split("/");
    console.log("https://example.com/" + myUrl[3]);
});

我试图用forEach然后使用URL的split输出json对象，这样我就可以得到URL的第二部分，即cat1, cat2, cat3。每个网址没有确定的长度。

您知道如何实现以下输出吗？我正设法在forEach循环内完成它。

https://example.com/cat1
https://example.com/cat1
https://example.com/cat1
https://example.com/cat2
https://example.com/cat2
https://example.com/cat3

注意：类别不限于cat1，cat2，cat3。也可以是https://example.com/news或https://example.com/events

任何帮助将不胜感激。谢谢。

Answer 1

您可以获得第一个路径的链接并对数组进行排序。

var urlList = [{ URL: "https://example.com/cat1/aa/bb/cc", "Last crawled": "Jun 23, 2019" }, { URL: "https://example.com/cat2/aa", "Last crawled": "Jun 23, 2019" }, { URL: "https://example.com/cat1/aa/bb/cc/dd/ee", "Last crawled": "Jun 23, 2019" }, { URL: "https://example.com/cat3/aa/bb/cc/", "Last crawled": "Jun 23, 2019" }, { URL: "https://example.com/cat2/aa/bb", "Last crawled": "Jun 23, 2019" }, { URL: "https://example.com/cat1/aa/bb", "Last crawled": "Jun 23, 2019" }],
    result = urlList
        .map(({ URL }) => URL.match(/^https:\/\/example.com\/[^\/]+(?=\/)/)[0])
        .sort((a, b) => a.localeCompare(b));

console.log(result);

Answer 2

使用underscore.js的示例（您可以将电话与我为理解目的而分割的下划线链接在一起）：

var s = _.map(urlList, function(i) {
  return i.URL.split("/")[3];
});
var sorted = _.sortBy(s)
var projection = _.map(sorted, function(p) {
  console.log("https://example.com/" + p);
});

jsfiddle中的示例：

https://jsfiddle.net/1nwg9pq7/

如何在没有javascript键的情况下将forEach结果分组？

2 个答案: