我想构建一个总是插入的函数 JSON Items 在 last 前一项。
const array = [
{India: { Score: '12', PlayedMatched: '21' } },
{ China: { Score: '52', PlayedMatched: '51' }},
{ USA: { Score: '15', PlayedMatched: '06' } },
// Insert Items Here
{ 'Index Value': 12 }
]
const insert = (arr, index, newItem) => [
...arr.slice(0, index),
newItem,
...arr.slice(index)
]
var insertItems= [{ 'Japan': { Score: "54", PlayedMatched: "56" } },{ 'Russia': { Score: "99", PlayedMatched: "178" } }];
// I have tried like this: array.slice(-1) to insert item one step before always
const result = insert(array,array.slice(-1),insertItems)
console.log(result);输出：
[ [ { Japan: [Object] }, { Japan: [Object] } ], //Not at Here
{ India: { Score: '12', PlayedMatched: '21' } },
{ China: { Score: '52', PlayedMatched: '51' } },
{ USA: { Score: '15', PlayedMatched: '06' } },
{ 'Index Value': 12 } ]预期产出：
[
{ India: { Score: '12', PlayedMatched: '21' } },
{ China: { Score: '52', PlayedMatched: '51' } },
{ USA: { Score: '15', PlayedMatched: '06' } },
[ { Japan: [Object] }, { Japan: [Object] } ], //At here
{ 'Index Value': 12 }
]我该怎么做？我还想删除以下内容： [] 在我的输出结果中：）
这样地：
[
{India: { Score: '12', PlayedMatched: '21' } },
{ China: { Score: '52', PlayedMatched: '51' }},
{ USA: { Score: '15', PlayedMatched: '06' } },
{ 'Japan': { Score: "54", PlayedMatched: "56" } },
{ 'Russia': { Score: "99", PlayedMatched: "178" } },
{ 'Index Value': 12 }
]
2条答案
按热度按时间chhkpiq41#
只需将要插入的索引号作为
index用于完成作业的insert函数中的参数。你的情况是最后一名，所以你可以通过array.length - 1```const array = [
{India: { Score: '12', PlayedMatched: '21' } },
{ China: { Score: '52', PlayedMatched: '51' }},
{ USA: { Score: '15', PlayedMatched: '06' } },
{ 'Index Value': 12 }
]
const insert = (arr, index, newItem) => [
...arr.slice(0, index),
...newItem,
...arr.slice(index)
]
var insertItems= [{ 'Japan': { Score: "54", PlayedMatched: "56" } },{ 'Russia': { Score: "99", PlayedMatched: "178" } }];
const result = insert(array,array.length - 1,insertItems)
console.log(result);
7bsow1i62#
按如下方式使用拼接功能：
请注意，splice会修改您提供给它的同一阵列，而不会创建该阵列的修改副本。