$.Array(param, array)中的param必需是数字。所以param一定要转换乘数组内的对象。
$.inArray(parseInt(vm.businessAreaId.substr(0, 6)), vm.districtIds) != -1//true
$.inArray(vm.businessAreaId.substr(0, 6), vm.districtIds) != -1//false
$.inArray(parseInt(vm.businessAreaId.substr(0, 6)), vm.districtIds) != -1//true
$.inArray(vm.businessAreaId.substr(0, 6), vm.districtIds) != -1//false