Record.group

group 函数根据 Record 中指定的字段对记录进行分组（阶层化）。

示例

var ary=[
	{"x":"a1","y":"b1","z":"c1"},
	{"x":"a1","y":"b1","z":"c2"},
	{"x":"a1","y":"b2","z":"c3"},
	{"x":"a2","y":"b2","z":"c4"},
	{"x":"a2","y":"b3","z":"c5"},
	{"x":"a2","y":"b3","z":"c6"},
];
var obj=new Record(ary).group("x","y");
/*
obj is the next
{"a1":{"b1":[{"z":"c1"},
             {"z":"c2"}
            ],
       "b2":[{"z":"c3"}]
      },
 "a2":{"b2":[{"z":"c4"}],
       "b3":[{"z":"c5"},
             {"z":"c6"}
            ]
      }
}
*/

API

调用	返回值
`record. group ( key1, key2,... )`	`Object`

参数	类型	描述
`key`	`String`	字段名。