javascript - 将逗号分隔的字符串数组转换为不同的数组

我想要一个对象数组:

var objArr = [
    {id:1, name:'test', seenby:'user1, user2, user3'},
    {id:2, name:'test1', seenby:'user3, user4'},
    {id:3, name:'test2', seenby:'user1, user3'},
    {id:4, name:'test3', seenby:'user2'}
];

并返回所有“seenby”用户的不同数组:

var seenByArr = ['user1', 'user2', 'user3', 'user4']

我无法弄清楚如何有效地(可能的最小限度的线数)将其变成一系列不同的值。请查看我的小提琴作为示例:https://jsfiddle.net/ksumarine/ss3v7dgj/

最佳答案

您可以尝试关注

$.each(list, function(index, value) {
    $.each(value.seenby.split(","), function(i, val) {
        if (val !== undefined && val.trim() !== "" && arr.indexOf(val.trim()) == -1) {
            arr.push(val.trim());
        }
    });
});

供引用-https://jsfiddle.net/ss3v7dgj/1/