Javascript 如何从数组中获取唯一值？

我在uniq之前和之后的数据是相同的

var years = this.api().columns(2).data().toArray().sort();
console.log(years + " before uniq");
var duplicateFreeYears = Array.from(new Set(years));
const uniqueTopicList = _.uniq(years)
console.log("||" + duplicateFreeYears + " after duplicateFreeYears||");
console.log("||" + uniqueTopicList + " after uniqueTopicList||");

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我仍然得到相同的数据

函数将为您提供更新阵列的副本

您必须显示此重复阵列：

2016,2016,2015,2015,2015,2015,2015,2015,2015,2015,2015,2015,2015,2015 before uniq


||2016,2016,2015,2015,2015,2015,2015,2015,2015,2015,2015,2015,2015,2015 after duplicateFreeYears||


||2016,2016,2015,2015,2015,2015,2015,2015,2015,2015,2015,2015,2015,2015 after uniqueTopicList||

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通过将其转换为集合，然后再转换为数组，可以解决此问题：

var duplicateArray = _.uniq(years);
console.log(duplicateArray + " after uniq");

返回重复的空闲数组。它不修改原始数组。第一步：返回非重复数组的新数组。的可能重复
Array.from(new Set(years));