javascript - 返回日期数组中的最新日期

Question

我的 json 如下:

  "reviews":[
    {
    "notes": "Great place, perfect location but the best part was the Staff. Thank you so much for making our trip so wonderful!",
    "date": "2015-04-18",
    "rating":{"overall": 100}
    },
    {
    "notes": "I messed up the days I was supposed to be there but they did everything they could to get me a room, which I did. The guy at the front was super nice and then drew me an entire map based off of how much time I had there in Rome. It was extremely helpful and the restaurant he recommends (a friends who you get 10% off of) had good lasagna. Great place for a really reasonable price. Also, the doors do not automatically lock for you room, so just remember to lock your door when you leave. ",
    "date": "2016-04-18",
    "rating":{"overall": 94}
    }
    ]

我正在尝试获取最新日期(最近的)，以便我可以打印相关的“注释”。

      function highestReview() {
        var maxNumb = [];
        for(var y = 0; y < data.reviews.length; y++){
          maxNumb.push(data.reviews[y].date);
        }
       var latestDate = new Date(Math.max.apply(null, maxNumb));
        console.log(latestDate);

      }
      highestReview();

我收到“无效日期”

Answer 1

As per the docs, If at least one of arguments cannot be converted to a number, the result is NaN And new Date(NaN) will be Invalid Date

将日期字符串包装在new Date中，同时插入数组。当DateObject通过Number传递时，将返回代表日期的数值。

var data = {
  "reviews": [{
    "notes": "Great place, perfect location but the best part was the Staff. Thank you so much for making our trip so wonderful!",
    "date": "2015-04-18",
    "rating": {
      "overall": 100
    }
  }, {
    "notes": "I messed up the days I was supposed to be there but they did everything they could to get me a room, which I did. The guy at the front was super nice and then drew me an entire map based off of how much time I had there in Rome. It was extremely helpful and the restaurant he recommends (a friends who you get 10% off of) had good lasagna. Great place for a really reasonable price. Also, the doors do not automatically lock for you room, so just remember to lock your door when you leave. ",
    "date": "2016-04-18",
    "rating": {
      "overall": 94
    }
  }]
};

function highestReview() {
  var maxNumb = [];
  for (var y = 0; y < data.reviews.length; y++) {
    maxNumb.push(new Date(data.reviews[y].date));
  }
  var latestDate = new Date(Math.max.apply(null, maxNumb));
  console.log(latestDate);
}
highestReview();