我有这种一级树情况：
<select ng-model="tipost" ng-options="tip.DESC group by tip.TIPIS for tip in tipall"><br> </select>
json在哪里：
[ {"ID":"1", "IDPARENT":"0", "TIPIS":"", "DESC":"GroupName1"}, {"ID":"2", "IDPARENT":"1", "TIPIS":"GroupName1", "DESC":"CHILDNAME1"}, {"ID":"3", "IDPARENT":"0", "TIPIS":"", "DESC":"GroupName2"} ]
问题在于，这会与孩子一起创建optgroup，但也会重复其根：
- GroupName1 - GroupName2 [ GroupName1 ] - CHILDNAME1 [ GroupName2 ]
我想生产：
[ GroupName1 ] - CHILDNAME1 [ GroupName2 ]
如果您将json更改为以下内容，则分组将无法完全实现：
[ {"ID":"1", "TIPIS":"GroupName1", "DESC":"name"}, {"ID":"2", "TIPIS":"GroupName1", "DESC":"name1"}, {"ID":"3", "TIPIS":"GroupName2", "DESC":"name2"}, {"ID":"4", "TIPIS":"GroupName1", "DESC":"name3"}, ]
然后，您将按照想要的方式进行分组
jsFiddle：http : //jsfiddle.net/rtCP3/182/
