我有以下函数,但是说的是charAt是未定义的。该错误与警报行有关。如果我做警报(值),它给我的值(value)没有问题。
$scope.markAnswer = function(answerID, questionID) {
if ($scope.containsObject(answerID, $scope.selectedAnswer)) {
$scope.selectedAnswer.splice($scope.selectedAnswer.indexOf(answerID), 1);
} else {
$scope.selectedAnswer.push(answerID);
}
angular.forEach($scope.selectedAnswer, function(value, key) {
alert(value.charAt(0));
if(questionID == res){
$log.info("questionID");
}
});
}
出现以下错误:
TypeError: undefined is not a function
at http://127.0.0.1:9000/modules/core/controllers/home.js:57:25
at Object.forEach (http://127.0.0.1:9000/lib/angular/angular.js:325:18)
at Scope.$scope.markAnswer (http://127.0.0.1:9000/modules/core/controllers/home.js:56:17)
at http://127.0.0.1:9000/lib/angular/angular.js:10903:21
at http://127.0.0.1:9000/lib/angular-touch/angular-touch.js:441:9
at Scope.$eval (http://127.0.0.1:9000/lib/angular/angular.js:12811:28)
at Scope.$apply (http://127.0.0.1:9000/lib/angular/angular.js:12909:23)
at HTMLDivElement.<anonymous> (http://127.0.0.1:9000/lib/angular-touch/angular-touch.js:440:13)
at HTMLDivElement.jQuery.event.dispatch (http://127.0.0.1:9000/lib/jquery/dist/jquery.js:4430:9)
at HTMLDivElement.elemData.handle (http://127.0.0.1:9000/lib/jquery/dist/jquery.js:4116:28)
最佳答案
您可以尝试以下一种方法:
String(value).charAt(0)
我想发生这种情况是因为您的值不是字符串,而
charAt
是一种返回字符串中指定索引处的字符的方法。关于javascript - charAt作为未定义返回,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/27777841/