August 2017
Intermediate to advanced
272 pages
5h 32m
Chinese
Content preview from Node.js物聯網裝置開發
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JavaScript 執行環境
|
15
網頁瀏覽器通常都內建整合式除錯器，可讓你設定中斷點，這麼做往往很不錯，可更
加了解底層到底發生了什麼事。關於瀏覽器執行 JavaScript 程式，將於第 10 章進一步
介紹。
伺服器
JavaScript 在伺服器端的基礎，於 2008 年開始，也就是當 Google 公司釋出開放原始碼
的 JavaScript 執行引擎 V8 時。V8 專案屬於 Google Chrome 瀏覽器的一部分。
一年後，Ryan Dahl 釋出 Node.js，為檔案系統和硬體驅動器添加了事件迴圈與低階的
JavaScript API。而且，因為藉助 V8 這套引擎，在世界上各種最為重要的運算平台上，
Node.js 皆能運行，從伺服器、平板、到智慧型手機，通通都可以。
Node.js 生態系統有一極為重要的部分，以 npm 為基礎，npm 是 Node Package Manager
（Node 套件管理員）的縮寫。Node.js 的套件可透過 npm 註冊中心發佈出去，現已包含
超過 10 萬個開源套件，供你下載、修改、用於自己的專案。
舉例而言，若需要開發 I2C 標籤
1
的程式庫，可到 npm 網站，在搜尋欄位鍵入「i2c」，
如圖 1-8 所示。
圖 1-8 npmjs.com 網站的搜尋結果
1 I2C 是一種序列傳輸協定，詳情請見 NXP 規格書（
http://www.nxp.com/documents/user_manual/UM10204.
pdf
）。
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