【Javascript】数组扩展方法：根据key重新分组

 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 } ]
    }
]