按對象的屬性過濾對象的JavaScript數組並刪除重復項

Question

我有一系列對象

[
{"title": "video01", "src":"/embed/video1","hero":"hero1"},    
{"title": "video02", "src":"/embed/video2","hero":"hero1"},    
{"title": "video03", "src":"/embed/video3","hero":"hero1"},    
{"title": "video04", "src":"/embed/video4","hero":"hero2"},    
{"title": "video05", "src":"/embed/video5","hero":"hero2"},    
{"title": "video06", "src":"/embed/video6","hero":"hero3"},    
{"title": "video07", "src":"/embed/video7","hero":"hero3"},    
{"title": "video08", "src":"/embed/video8","hero":"hero3"}]

我需要返回[hero1，hero2，hero3]的最佳方法是什么？

感謝你的幫助

Answer 1

在這里已經討論了從數組中刪除重復項：數組中的唯一值

如果您可以訪問Array.prototype.indexOf ，則檢查重復項很容易（FF，Chrome，Opera和IE> = 9，請參見兼容性表 ）：

var heroes = [];
for (var i = 0 ; i < myArray.length ; i++) {
    var heroName = myArray[i].hero;
    if (heroes.indexOf(heroName) == -1) {
        heroes.push(heroName);
    }
}