Javascript / Es5

[Javascript] Check if value exists in Array

一般常見的需求像是：

  1. 當 array 找到此 value 时，即停止輸入新的 value 到數組裡
  2. 當 array 包含特定 value 时，即執行某個 script
  3. 等等不勝凡舉

rails 在處理 value 是否存在 array 裡很容易，運用 include or exists
而在 javascript 是怎麼檢查 value 是否存在 array 裡？

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PostgreSQL apache2 api array async auto aws beautify-ruby benchmark bloomfilter bot branch bucket bug build build_stubbed centos chrome class collection command commit compass cookie count css databases db domain enum error es5 es6 eth exists extend factorybot factorygirl feeling figaro fixed font-size git godaddy hangzhou heroku hexo index install instance ios javascript jquery json lazy-loading learn lendbot lending length linode linux load-more logdown mariadb material-design meetup member migration modal mysql mysql@5.7 notify package-install pakogi performance poloniex pq preventDefault problm psql rails rake redis remote resource rollback routes rspec rss ruby ruby-on-rails s3 sass sass-convert screen scroll scss seo session setting share shell-script size spec speed stash stopPropagation string sublime symbol telegram test ubuntu url utf utf8mb4 version visual-studio wallet wget wordpress wpf xml youtube

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