Error: ngModel:constexpr Non-Constant Expression
1.3版本
<input type="checkbox" ng-model="test3" ng-true-value="yes" ng-false-value="no"> 1.5版本
<input type="checkbox" ng-model="test3" ng-true-value="'yes'" ng-false-value="'no'"> 兼容
<input type="checkbox" ng-model="test3" ng-true-value="1" ng-false-value="0"> $scope.test3 = '1' 需要是字符串