数据结构是这样子的：

01.png

思路：数组很深，想要过滤最深的项，首先使用map一层一层遍历，拿到对应数组后，使用filter()方法return返回符合条件的数组项。
注意：map遍历改变引用类型的数组时，会改变原数组。所以使用：
“const obj = { ...item, list:item.list.filter(item => {return item.checked == 1})};
return obj;”
避免原数组发生改变。
对比1和2.
1、我想拿到data下checked = 1的数据，把checked = 0的过滤掉

var carListUpdate = [
{"name":"车辆1","list":[
{"id":10,"number":"74201050","checked":1},
{"id":11,"number":"74201051","checked":0},
{"id":12,"number":"74201052","checked":0},
{"id":13,"number":"74201053","checked":0},
{"id":14,"number":"74201054","checked":0},
{"id":15,"number":"74201055","checked":0},
{"id":16,"number":"74201056","checked":0},
{"id":17,"number":"74201057","checked":0},
{"id":43,"number":"74201058","checked":0}
]},
{"name":"车辆2","list":[
{"id":18,"number":"73602018","checked":1},
{"id":19,"number":"73602019","checked":0},
{"id":20,"number":"73602026","checked":0},
{"id":21,"number":"73602027","checked":0},
{"id":22,"number":"73602048","checked":0},
{"id":23,"number":"73602059","checked":0},
{"id":24,"number":"73602060","checked":0},
{"id":25,"number":"73602080","checked":0},
{"id":26,"number":"73602081","checked":0},
{"id":27,"number":"73602102","checked":0},
{"id":28,"number":"73602103","checked":0}
]},
{"name":"车辆3","list":[
{"id":30,"number":"60100760","checked":1},
{"id":29,"number":"","checked":0},
{"id":31,"number":"60101028","checked":0},
{"id":32,"number":"60101068","checked":0},
{"id":33,"number":"60101069","checked":0},
{"id":34,"number":"60101040","checked":0},
{"id":35,"number":"60101041","checked":0},
{"id":36,"number":"60101078","checked":0},
{"id":37,"number":"60101079","checked":0},
{"id":38,"number":"60101055","checked":0},
{"id":39,"number":"60101058","checked":0},
{"id":40,"number":"60101059","checked":0},
{"id":41,"number":"60101060","checked":0},
{"id":42,"number":"60101065","checked":0}
]}
]
let tempCars = carListUpdate.map(item =>item).map(item => {
          const obj = { ...item, list:item.list.filter(item => {return item.checked == 1})};
          return obj;
     })
console.log(tempCars)

结果：

tempCars = [
{"name":"车辆1","list":[
{"id":10,"number":"74201050","checked":1}
]},
{"name":"车辆2","list":[
{"id":18,"number":"73602018","checked":1}
]},
{"name":"车辆3","list":[
{"id":30,"number":"60100760","checked":1}
]}
]

2、我想只想拿到checked = 1 的数组项，其他的过滤掉

var carDetail = [
    {"name":"车辆1","list":[
        {"id":28,"lp_number":"C6G611","checked":1},
        {"id":30,"lp_number":"RRW392","checked":0},
        {"id":31,"lp_number":"AN3996","checked":0},
        {"id":32,"lp_number":"B17930","checked":0},
        {"id":33,"lp_number":"LW3885","checked":0},
        {"id":34,"lp_number":"RB1631","checked":0},
        {"id":35,"lp_number":"AN8069","checked":0},
        {"id":36,"lp_number":"B33252","checked":0},
        {"id":37,"lp_number":"AD3912","checked":0},
        {"id":39,"lp_number":"B03933","checked":0},
        {"id":40,"lp_number":"AS6931","checked":0},
        {"id":41,"lp_number":"AX1226","checked":0},
        {"id":42,"lp_number":"AF6130","checked":0},
        {"id":43,"lp_number":"AX1109","checked":0},
        {"id":44,"lp_number":"AX1012","checked":0},
        {"id":45,"lp_number":"B38572","checked":0},
        {"id":46,"lp_number":"C22593","checked":0},
        {"id":47,"lp_number":"C22683","checked":0},
        {"id":48,"lp_number":"CA8051","checked":0},
        {"id":49,"lp_number":"CA2127","checked":0},
        {"id":50,"lp_number":"CA9950","checked":0},
        {"id":51,"lp_number":"CA1193","checked":0}
    ]},
    {"name":"车辆2","list":[
        {"id":10,"number":"74201050","checked":1},
        {"id":17,"number":"74201057","checked":0},
        {"id":43,"number":"74201058","checked":0}
    ]},
    {"name":"车辆3","list":[
        {"id":20,"number":"73602026","checked":1},
        {"id":22,"number":"73602048","checked":0},
        {"id":26,"number":"73602081","checked":0},
        {"id":27,"number":"73602102","checked":0},
        {"id":28,"number":"73602103","checked":0}
    ]},
    {"name":"车辆4","list":[
        {"id":29,"number":"","checked":1},
        {"id":30,"number":"60100760","checked":0},
        {"id":32,"number":"60101068","checked":0},
        {"id":36,"number":"60101078","checked":0},
        {"id":37,"number":"60101079","checked":0},
        {"id":40,"number":"60101059","checked":0},
        {"id":41,"number":"60101060","checked":0}
    ]}
]

const xx = carDetail.map(item =>item).map(item => item.list.filter(item => {return item.checked == 1}))
console.log(JSON.stringify(xx))

结果：

[
    [
        {"id":28,"lp_number":"C6G611","checked":1}
    ],
    [
        {"id":10,"number":"74201050","checked":1}
    ],
    [
        {"id":20,"number":"73602026","checked":1}
    ],
    [
        {"id":29,"number":"","checked":1}
    ]
]