对对象的代理数组进行排序，localeCompare 不是函数答案

【问题标题】：Sort Proxy Array of Objects, localeCompare is not a function对对象的代理数组进行排序，localeCompare 不是函数
【发布时间】：2021-11-13 00:22:03
【问题描述】：

尝试使用 ES6 arrayObj.sort(a,b) => a.property.localeCompare(b.property) 语法但出现错误：

TypeError: a.property.localeCompare 不是函数。

我在想localeCompare 不在范围内但不明白如何将其绑定到排序范围，可能是因为数据存储在代理中？我也在 VueJS 3 中工作，但认为这与这个问题无关。

myData = 
Proxy {0: {…}, 1: {…}, 2: {…}, 3: {…}, 4: {…}}
[[Handler]]: Object
[[Target]]: Array(5)
0: {itemIndex: 1, itemFmt: 2, itemFmtName: 'Call To Order', guid: 'd66af412-00a0-4c49-b8b5-abaefb79fed0', maxCt: 1, …}
1: {itemIndex: 2, itemFmt: 6, itemFmtName: 'Title/Discussion/Motion', guid: '9f7b9d34-3fcb-42c7-866e-a56f71a8aa4f', maxCt: 0, …}
2: {itemIndex: 4, itemFmt: 6, itemFmtName: 'Title/Discussion/Motion', guid: '406bea5e-1cb0-4d90-96e9-9b80b64ff8ba', maxCt: 0, …}
3: {itemIndex: 5, itemFmt: 6, itemFmtName: 'Title/Discussion/Motion', guid: 'ad9aacda-5100-4eef-9ead-c61e1ec0c285', maxCt: 0, …}
4: {itemIndex: 7, itemFmt: 3, itemFmtName: 'Roll Call', guid: '1715f7a3-066d-4787-8233-a36df2a729a9', maxCt: 1, …}

myData.sort((a, b) => a.itemIndex.localeCompare(b.itemIndex))

【问题讨论】：

标签： javascript vue.js sorting vuejs3 arrayobject

【解决方案1】：

localeCompare 是 method of String，但 a.itemIndex 是 Number，因此该方法在该属性上不可用。

要按itemIndex 排序，请对两个Numbers 使用减法：

const myData = [
  {itemIndex: 1, itemFmt: 2, itemFmtName: 'Call To Order', guid: 'd66af412-00a0-4c49-b8b5-abaefb79fed0', maxCt: 1 },
  {itemIndex: 2, itemFmt: 6, itemFmtName: 'Title/Discussion/Motion', guid: '9f7b9d34-3fcb-42c7-866e-a56f71a8aa4f', maxCt: 0},
  {itemIndex: 4, itemFmt: 6, itemFmtName: 'Title/Discussion/Motion', guid: '406bea5e-1cb0-4d90-96e9-9b80b64ff8ba', maxCt: 0},
  {itemIndex: 5, itemFmt: 6, itemFmtName: 'Title/Discussion/Motion', guid: 'ad9aacda-5100-4eef-9ead-c61e1ec0c285', maxCt: 0},
  {itemIndex: 7, itemFmt: 3, itemFmtName: 'Roll Call', guid: '1715f7a3-066d-4787-8233-a36df2a729a9', maxCt: 1},
]

// sort by itemIndex in ascending order
myData.sort((a,b) => a.itemIndex - b.itemIndex)

console.log(myData)

要按itemFmtName 排序，请在两个Strings 上使用localeCompare：

const myData = [
  {itemIndex: 1, itemFmt: 2, itemFmtName: 'Call To Order', guid: 'd66af412-00a0-4c49-b8b5-abaefb79fed0', maxCt: 1 },
  {itemIndex: 2, itemFmt: 6, itemFmtName: 'Title/Discussion/Motion', guid: '9f7b9d34-3fcb-42c7-866e-a56f71a8aa4f', maxCt: 0},
  {itemIndex: 4, itemFmt: 6, itemFmtName: 'Title/Discussion/Motion', guid: '406bea5e-1cb0-4d90-96e9-9b80b64ff8ba', maxCt: 0},
  {itemIndex: 5, itemFmt: 6, itemFmtName: 'Title/Discussion/Motion', guid: 'ad9aacda-5100-4eef-9ead-c61e1ec0c285', maxCt: 0},
  {itemIndex: 7, itemFmt: 3, itemFmtName: 'Roll Call', guid: '1715f7a3-066d-4787-8233-a36df2a729a9', maxCt: 1},
]

// sort by itemFmtName in alphabetical order
myData.sort((a,b) => a.itemFmtName.localeCompare(b.itemFmtName))

console.log(myData)

【讨论】：