javascript - 从json中删除第一条和最后两条记录

Question

data:[
  { user: "2016-04-14", avg_: "13", new: "32511.20" },
  { user: "2016-04-21", avg_: "32", new: "32779.17" },
  { user: "2016-04-22", avg_: "32", new: "32898.40" },
  { user: "2016-04-23", avg_: "32", new: "32903.11" },
  { user: "2016-04-24", avg_: "32", new: "329" },
  { user: "2016-04-25", avg_: "3298", new: "32962.78" }
];

我试过了，它成功地删除了最后两个元素

for (var i = 1; i <= 2; i++) {
    var s = data.splice(-1, i);
    console.log(s);
}

现在，我不想重复这个逻辑来删除前两个任何想法？

Answer 1

您只需使用 slice 即可在没有循环的情况下简单地获取前两个和最后一个元素。

const data = [
        {user: "2016-04-14", avg_: "13", new: "32511.20"},
        {user: "2016-04-21", avg_: "32", new: "32779.17"},
        {user: "2016-04-22", avg_: "32", new: "32898.40"},
        {user: "2016-04-23", avg_: "32", new: "32903.11"},
        {user: "2016-04-24", avg_: "32", new: "329"},
        {user: "2016-04-25", avg_: "3298", new: "32962.78"}
      ];
    
    const res = [...data.slice(0, 2), ...data.slice(-2)]
console.log(res);

或者如果你想去掉前两个保留剩下的，你可以这样写

const data = [
        {user: "2016-04-14", avg_: "13", new: "32511.20"},
        {user: "2016-04-21", avg_: "32", new: "32779.17"},
        {user: "2016-04-22", avg_: "32", new: "32898.40"},
        {user: "2016-04-23", avg_: "32", new: "32903.11"},
        {user: "2016-04-24", avg_: "32", new: "329"},
        {user: "2016-04-25", avg_: "3298", new: "32962.78"}
      ];
    
    const res = data.slice(2, -2)
console.log(res);