如何在angularJS中按對(duì)象屬性過(guò)濾我試圖在AngularJS中創(chuàng)建一個(gè)自定義過(guò)濾器，該過(guò)濾器將通過(guò)特定屬性的值過(guò)濾對(duì)象列表。在這種情況下，我想按“極性”屬性（“正”，“中性”，“負(fù)”的可能值）進(jìn)行過(guò)濾。這是我沒(méi)有過(guò)濾器的工作代碼：HTML：<div class="total">    <h2 id="totalTitle"></h2>    <div>{{tweets.length}}</div>    <div id="totalPos">{{tweets.length|posFilter}}</div>    <div id="totalNeut">{{tweets.length|neutFilter}}</div>    <div id="totalNeg">{{tweets.length|negFilter}}</div></div>這是JSON格式的“ $ scope.tweets”數(shù)組：{{created_at: "Date", text: "tweet text", user:{name: "user name", screen_name: "user       screen name", profile_image_url: "profile pic"}, retweet_count: "retweet count", polarity: "Positive"}, {created_at: "Date", text: "tweet text", user:{name: "user name", screen_name: "user screen name", profile_image_url: "profile pic"}, retweet_count: "retweet count", polarity: "Positive"}, {created_at: "Date", text: "tweet text", user:{name: "user name", screen_name: "user screen name", profile_image_url: "profile pic"}, retweet_count: "retweet count", polarity: "Positive"}}我可以提出的最佳過(guò)濾器如下：myAppModule.filter('posFilter', function(){return function(tweets){    var polarity;    var posFilterArray = [];    angular.forEach(tweets, function(tweet){        polarity = tweet.polarity;        console.log(polarity);        if(polarity==='Positive'){              posFilterArray.push(tweet);        }        //console.log(polarity);    });    return posFilterArray;};});此方法返回一個(gè)空數(shù)組。從“ console.log（polarity）”語(yǔ)句中不會(huì)打印任何內(nèi)容。似乎我沒(méi)有插入正確的參數(shù)來(lái)訪(fǎng)問(wèn)“極性”的對(duì)象屬性。有任何想法嗎？非常感謝您的回復(fù)。