1 //数组扩展：根据key重新分组
2 //field：按什么字段分组
3 Array.prototype.GroupByKey = function ( field )
4 {
5 var originalArr = this
6 let tempArr = []
7 let resultData = []
8 for ( let i = 0; i < originalArr.length; i++ )
9 {
10 if ( tempArr.indexOf( originalArr[ i ][ field ] ) === -1 )
11 {
12 resultData.push( {
13 [ field ]: originalArr[ i ][ field ],
14 data: [ originalArr[ i ] ]
15 } )
16 tempArr.push( originalArr[ i ][ field ] )
17 } else
18 {
19 for ( let j = 0; j < resultData.length; j++ )
20 {
21 if ( resultData[ j ][ field ] == originalArr[ i ][ field ] )
22 {
23 resultData[ j ].data.push( originalArr[ i ] )
24 break
25 }
26 }
27 }
28 }
29 return resultData // 最终输出
30 }
使用例子：
var scoreArr = [
{ name: "小明", subject: "语文", score: 88 },
{ name: "小明", subject: "数学", score: 58 },
{ name: "小红", subject: "数学", score: 85 },
{ name: "小红", subject: "语文", score: 99 },
]
var resultArr = scoreArr.GroupByKey( "name" )
得到结果：
[
{
name: "小明",
data: [ { name: "小明", subject: "语文", score: 88 },
{ name: "小明", subject: "数学", score: 58 } ]
},
{
name: "小红",
data: [ { name: "小红", subject: "数学", score: 85 },
{ name: "小红", subject: "语文", score: 99 } ]
}
]
