angular 复选框至少选中一个

<input type="checkbox" ng-model="form.cb1" ng-required="form.cb1 || form.cb2 || form.cb3">
<input type="checkbox" ng-model="form.cb2" ng-required="form.cb1 || form.cb2 || form.cb3">
<input type="checkbox" ng-model="form.cb3" ng-required="form.cb1 || form.cb2 || form.cb3">

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