Function getViewValue

test/angular/1.3/angular.js:26009–26018

(key, value)

        }

        function getViewValue(key, value) {
          if (key === '?') {
            return undefined;
          } else if (key === '') {
            return null;
          } else {
            var viewValueFn = selectAsFn ? selectAsFn : valueFn;
            return callExpression(viewValueFn, key, value);
          }
        }

        function getLabels() {
          var values = valuesFn(scope);