如何访问和删除/删除嵌套 Javascript 对象中的属性？

Question

由于 SO 用户对我在这里的初始问题的大力支持，我可以将建议的解决方案转移到我的特定项目环境中，并且几乎可以实现它。

我有一个返回的数组对象resultVolume ，其结构如下：

0: {x: "AUDUSD", y: 680, count: 10}
1: {x: "EURCAD", y: 690, count: 9}
2: {x: "USDCAD", y: 250, count: 8}
3: {x: "EURHUF", y: 600, count: 8}
4: {x: "CADCHF", y: 560, count: 7}
5: {x: "AUDNZD", y: 320, count: 7}
6: {x: "AUDCHF", y: 330, count: 7}
7: {x: "EURNOK", y: 590, count: 7}
8: {x: "EURJPY", y: 70, count: 7}
9: {x: "EURAUD", y: 430, count: 6}
10: {x: "EURSGD", y: 50, count: 5}
11: {x: "EURCHF", y: 50, count: 5}
12: {x: "GBPUSD", y: 370, count: 4}
13: {x: "AUDJPY", y: 80, count: 4}
14: {x: "CHFJPY", y: 240, count: 4}
15: {x: "USDJPY", y: 170, count: 4}
16: {x: "SGDJPY", y: 40, count: 4}
17: {x: "AUDCAD", y: 40, count: 4}

我现在想两者都做

• 切割第 5 个之后的所有对象（因此在第 4 个对象之后）和
  
• 从所有对象中删除count属性。

我尝试了以下方法：

delete resultCount.count;
const finalResultCount = resultCount.slice(0, 5);

返回

0: {x: "AUDUSD", y: 680, count: 10}
1: {x: "EURCAD", y: 690, count: 9}
2: {x: "USDCAD", y: 250, count: 8}
3: {x: "EURHUF", y: 600, count: 8}
4: {x: "CADCHF", y: 560, count: 7}
5: {x: "AUDNZD", y: 320, count: 7}

count属性没有被删除。

按照这些解决方案，我不确定如何访问每个对象，因为它们前面都有不同的数字。 所以可能我需要一个循环来实现预期的结果？

Answer 1

 const arr = [{x: "AUDUSD", y: 680, count: 10}, {x: "EURCAD", y: 690, count: 9}, {x: "USDCAD", y: 250, count: 8}, {x: "EURHUF", y: 600, count: 8}, {x: "CADCHF", y: 560, count: 7}, {x: "AUDNZD", y: 320, count: 7}] arr.forEach((item, index, array) => delete array[index].count); console.log(arr);

Answer 2

 var arr = [{ x: "AUDUSD", y: 680, count: 10 }, { x: "EURCAD", y: 690, count: 9 }, { x: "USDCAD", y: 250, count: 8 }, { x: "EURHUF", y: 600, count: 8 }, { x: "CADCHF", y: 560, count: 7 }, { x: "AUDNZD", y: 320, count: 7 }, { x: "AUDCHF", y: 330, count: 7 }, { x: "EURNOK", y: 590, count: 7 }, { x: "EURJPY", y: 70, count: 7 }, { x: "EURAUD", y: 430, count: 6 }, { x: "EURSGD", y: 50, count: 5 }, { x: "EURCHF", y: 50, count: 5 }, { x: "GBPUSD", y: 370, count: 4 }, { x: "AUDJPY", y: 80, count: 4 }, { x: "CHFJPY", y: 240, count: 4 }, { x: "USDJPY", y: 170, count: 4 }, { x: "SGDJPY", y: 40, count: 4 }, { x: "AUDCAD", y: 40, count: 4 }]; var newArr = arr.slice(0, 5).map(e => { delete e.count; return e; }); console.log(newArr);

Answer 3

let finalResultCount = resultCount.slice(0, 5);
finalResultCount.forEach(item => delete item.count);

Answer 4

 var resultVolume = [ {x: "AUDUSD", y: 680, count: 10}, {x: "EURCAD", y: 690, count: 9}, {x: "USDCAD", y: 250, count: 8}, {x: "EURHUF", y: 600, count: 8}, {x: "CADCHF", y: 560, count: 7}, {x: "AUDNZD", y: 320, count: 7}, {x: "AUDCHF", y: 330, count: 7}, {x: "EURNOK", y: 590, count: 7}, {x: "EURJPY", y: 70, count: 7}, {x: "EURAUD", y: 430, count: 6}, {x: "EURSGD", y: 50, count: 5}, {x: "EURCHF", y: 50, count: 5}, {x: "GBPUSD", y: 370, count: 4}, {x: "AUDJPY", y: 80, count: 4}, {x: "CHFJPY", y: 240, count: 4}, {x: "USDJPY", y: 170, count: 4}, {x: "SGDJPY", y: 40, count: 4}, {x: "AUDCAD", y: 40, count: 4}, ] delete resultVolume.splice(5); resultVolume.forEach(item => delete item.count); console.log(resultVolume);