如何Angularjs与$ localStorage的

Question

I want to restrict user to vote only one time for a question using $localstorage.

这里补充表决系统是我的代码： HTML：

<ul> 
    <li ng-repat="question in questions"> {{question.text}} 
    <button ng-click="upvote(question)">Vote</button> 
</li> 

JS：

$scope.upvote = function(question){ 
    var votedQuestions = []; 
$localStorage.votedQuestions = votedQuestions; 
if($localStorage.votedQuestions.indexof(question._id) === -1){ 

$localStorage.votedQuestions.push(question._id); 
console.log("Thanks for Voting"); 
} 
else { 
console.log("You already voted to this question"); 
} 

} 
} 

它给我的错误一样$localStorage.votedQuestions.indexof不是函数

，它不是存储多个问题，它只是更新对其他问题的localStorage阵列的问题ID点击

Answer 1

始终为您的$localStorage.votedQuestions为空数组因此用户始终拥有投票所有问题的可能性。

只是删除这条线，它会正常工作

//APP 
angular.module('myApp') 
    .run(['$localStorage', function($localStorage) { 
     $localStorage.votedQuestions = []; 
    }]) 

//Controller 
$scope.upvote = function(question) { 
    if ($localStorage.votedQuestions.indexof(question._id) === -1) { 
     $localStorage.votedQuestions.push(question._id); 
     console.log("Thanks for Voting"); 
    } else { 
     console.log("You already voted to this question"); 
    } 
}