Array.push（）和唯一项 [英] Array.push() and unique items

问题描述

我有一个将唯一值推送到数组的简单情况。它看起来像这样：

I have a simple case of pushing unique values into array. It looks like this:

  this.items = [];

  add(item) {
    if(this.items.indexOf(item) > -1) {
      this.items.push(item);
      console.log(this.items);
    }
  }

看起来很直接，对吧？不，看起来如此。它不会添加任何值。我确信这是我身上某种愚蠢的错误，但我似乎无法找到它。

Seems pretty straight-forward, right? No, as it appears. It doesn't add any values. I am sure it's some kind of silly mistake on my side, but I can't seem to find it.

推荐答案

是的小错误

if(this.items.indexOf(item) === -1) {
      this.items.push(item);
      console.log(this.items);
    }

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