javascript - 按两个条件对数据进行排序？

Question

我有一个 JSON 对象，我试图按时间和用户名的字母顺序对它进行排序:

示例数据:

   const obj = [ {"timestamp": 1487184625, "user": "Eric", "action": "navigate"},
    {"timestamp": 1487184655, "user": "Bill", "action": "browse"},
    {"timestamp": 1487184685, "user": "Eric", "action": "key press"},
    {"timestamp": 1487184715, "user": "John", "action": "idle"},
    {"timestamp": 1487184755, "user": "Tran", "action": "search"},
    {"timestamp": 1487098049, "user": "Tran", "action": "click"},
    {"timestamp": 1487098079, "user": "Eric", "action": "click"},
    {"timestamp": 1487098109, "user": "Tran", "action": "click"},
    {"timestamp": 1487098139, "user": "Bill", "action": "navigate"},
    {"timestamp": 1487184625, "user": "Eric", "action": "navigate"},
    {"timestamp": 1487184655, "user": "Bill", "action": "browse"},
    {"timestamp": 1487184685, "user": "Eric", "action": "key press"},
    {"timestamp": 1487184715, "user": "John", "action": "idle"},
    {"timestamp": 1487184755, "user": "Tran", "action": "search"},
    {"timestamp": 1487098049, "user": "Tran", "action": "click"},
    {"timestamp": 1487098079, "user": "Eric", "action": "click"},
    {"timestamp": 1487098109, "user": "Tran", "action": "click"},
    {"timestamp": 1487098139, "user": "Bill", "action": "navigate"}]

我试过这样的:

console.log(obj.sort((a,b) => {
  // if(a.user.localeCompare(b.user)){
  //   return 1
  // }
  // if(!a.user.localeCompare(b.user)){
  //   return -1
  // }
    if(a.timestamp > b.timestamp){
      return -1
    }
    if(a.timestamp < b.timestamp){
      return 1
    }
}))

但我似乎无法让它工作。我也想避免使用 Lodash。有什么建议吗？

Answer 1

这可以通过单个排序函数行来解决:

 var results = obj.sort((a, b) => {
   return a.user.localeCompare(b.user) || b.timestamp - a.timestamp
 })

fiddle here

这是有效的，因为如果 localeCompare 为零，|| 将只考虑第二个组件。

---

我还想指出 || 不仅使语句检查简洁，还允许您在排序要求中链接进一步检查。例如，假设您还想按第三个选项(比如操作)排序。您可以通过简单地添加另一个 ||，并进一步检查。