Question

如何匹配包含“tags”数组中匹配值的每个文章对象，例如，如果我只想列出包含“foo”和“bar”关键字的文章？

[
  {
    "articles": [
      {
        "_id": "0",
        "body": "This is a test article 1.",
        "tags": [ "foo", "bar" ]
      },
      {
        "_id": "2",
        "body": "This is a test article 2.",
        "tags": [ "baz", "bam" ]
      },
      {
        "_id": "4",
        "body": "This is a test article 4.",
        "tags": [ "foo", "bar", "baz", "bam" ]
      }
    ]
  }
]

以下是我的Express应用程序中的路由器，它调用此JSON文件：

router.get('/:tag', function (req, res, next) {
  fsAsync(function(err, data) {
    var articles = data[0].articles.reverse();

    var q = articles.filter(function (article) {
      return article.tags === req.params.tag;
    });

    var json = [{ articles: q }];

    // I want the results here
    console.log(json);

    res.render('blog-tag', {
      layout: 'main',
      data: json
    });
  });
});

Answer 1

查看标签是否在数组中。

var q = articles.filter(function (article) {
  var tagInArray = false;
  article.tags.forEach(function(tag){
      if(tag === req.params.tag){
         tagInArray = true;
      }
  });
  return tagInArray;
});

IndexOf

Answer 2

标签位于数组

中

 var q = articles.filter(function (article) {
 for (var i = 0;i<article.tags.length;i++){
 if(article.tags[i] === req.params.tag)
 return article.tags === req.params.tag;
 }
});

JSON：过滤数组中的匹配值

2 个答案: