vue数组数据处理问题。

数据格式如下,需要改变原数组 解析一下checkList

let data = [
    {
        "message": "未查询到单据 '2a0c166c-08c0-4e3c-b83c-6b1bdf24c113' 对应计量单位！",
        "id": "2a0c166c-08c0-4e3c-b83c-6b1bdf24c113",
        "productname": "iphone13",
        "productcode": "0003",
        "barcode": "",
        "category": "ab22b722-f3f2-4b34-a38c-311838fd554f",
        "categoryName": "笔记本",
        "brand": "3ca06784-de9c-400a-b7b0-826c231bfeaa",
        "brandName": "Apple",
        "spectemplate": "312e36e4-a74d-464c-b165-c3fc03dab03e",
        "spectemplateName": "颜色",
        "measureunit": "",
        "listprice": 0,
        "isrecommend": "1",
        "description": "",
        "lastModifier": "",
        "createdTime": "2021-10-09 11:21:39",
        "lastModifiedTime": "2021-10-11 14:15:36",
        "rightList": [
            {
                "id": "5fdb8dd0-5f67-4c8b-a23d-081de97717b1",
                "parentId": "2a0c166c-08c0-4e3c-b83c-6b1bdf24c113",
                "attributeName1": "大小1",
                "attributeValue1": "小",
                "attributeName2": "颜色",
                "attributeValue2": "白色",
                "skuCode": "1001",
                "skuName": "iphone13",
                "price": 6000,
                "isShelf": "上架",
                "uniqueCategoryKey": "1323"
            },
            {
                "id": "d08c8f6b-f53f-49f2-b681-06d9e1c42cef",
                "parentId": "2a0c166c-08c0-4e3c-b83c-6b1bdf24c113",
                "attributeName1": "大小1",
                "attributeValue1": "小",
                "attributeName2": "颜色",
                "attributeValue2": "黑色",
                "skuCode": "1002",
                "skuName": "iphone13pro",
                "price": 7000,
                "isShelf": "上架",
                "uniqueCategoryKey": "1322"
            }
        ],
        "checkList": [
            "{\"id\":\"5fdb8dd0-5f67-4c8b-a23d-081de97717b1\",\"parentId\":\"2a0c166c-08c0-4e3c-b83c-6b1bdf24c113\",\"attributeName1\":\"大小1\",\"attributeValue1\":\"小\",\"attributeName2\":\"颜色\",\"attributeValue2\":\"白色\",\"skuCode\":\"1001\",\"skuName\":\"iphone13\",\"price\":6000,\"isShelf\":\"上架\",\"uniqueCategoryKey\":\"1323\"}",
            "{\"id\":\"d08c8f6b-f53f-49f2-b681-06d9e1c42cef\",\"parentId\":\"2a0c166c-08c0-4e3c-b83c-6b1bdf24c113\",\"attributeName1\":\"大小1\",\"attributeValue1\":\"小\",\"attributeName2\":\"颜色\",\"attributeValue2\":\"黑色\",\"skuCode\":\"1002\",\"skuName\":\"iphone13pro\",\"price\":7000,\"isShelf\":\"上架\",\"uniqueCategoryKey\":\"1322\"}"
        ]
    }
]

我这么写原数组并没有被改变，求详细解释

//增加属性确定按钮
    onSave() {
      this.copyLeftData = JSON.parse(JSON.stringify( this.leftData))
      this.copyLeftData =  this.copyLeftData.filter(items=>items.checkList.length>0)
      this.copyLeftData.forEach(item=>{
        console.log(item)
        item.checkList.forEach(item2=>{
          let rightItem = item2;
          if (typeof item2 == "string") {
          item2 =  JSON.parse(item2)
            // rightItem = JSON.parse(item2);
            // console.log(rightItem,'确定数据11111111111')
          }
        })
       
      })

数组filter、map之类函数返回的是一个新数组，你可以再链式调用上把这些步骤直接走完后把新数组给源数组

this.copyLeftData = JSON.parse(JSON.stringify( this.leftData))
  .filter(items => items.checkList.length>0)
  .map(item => item.map(item2 => typeof item2 == "string" ? JSON.parse(item2) : item2))