let groups = {}
array.forEach(function (o) {
var group = JSON.stringify(f(o))
groups[group] = groups[group] || []
groups[group].push(o)
})
return Object.keys(groups).map(function (group) {
return groups[group]
})
}
const arrayGroupBy = (list, groupId) =>{
let sorted = groupBy(list, function (item) {
return [item[groupId]]
})
return sorted
}
arrayGroupBy(数组, '字段名称')
若后台返回格式如下：
let data = [
{"createdAt": "2020-08-02T11:00:24.580Z", "name": "西瓜"},
{"createdAt": "2020-08-03T11:00:24.580Z", "name": "水蜜桃"},
{"createdAt": "2020-08-03T11:00:24.580Z", "name": "樱桃"},
{"createdAt": "2020-08-02T11:00:24.580Z", "name": "西柚"},
]
方法：使用 dayjs(createdAt).format('YYYY-MM-DD') 转换
注：dayjs 安装引用
npm install dayjs --save import dayjs from 'dayjs'
for ( let i=0i<array.lengthi++ ) {
let createdAt = dayjs(array[i].time)
array[i].createdAt = createdAt
}
mapName (array) {
let newArray = []
array.forEach((item, i) =>{
let index = -1
let alreadyExists = newArray.some((newItem, j) =>{
if (item.createdAt === newItem.createdAt) {
index = j
return true
}
})
if (!alreadyExists) {
newArray.push({
createdAt: item.createdAt,
name: [item.name]
})
} else {
newArray[index].price.push(item.name)
}
})
return newArray
}
你是想把数组中，每个元素，按照元素的值，按照一定规则进行重新分组吧。比如，你的例子里，元素的值以"a"打头的，放一个数组，以"b"打头的放一个数组里，首先遍历数组，然后根据规则重新挑选元素，放入新数组中。var a=[],b=[]
for(var i=0i<example.lengthi++){
if(example[i].substring(0,1)=="a"){
a.push(example[i])
break
}
if(example[i].substring(0,1)=="b"){
b.push(example[i])
break
}
}
也可以按照其他规则进行区分，看你的区分规则了。
