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                ### Javascript 的組成 ![](https://img.kancloud.cn/3d/fd/3dfde3cec917472d1794a74252236c1f_838x603.png) **ECMAScript** ECMAScript 定義了JavaScript 的語法規范,是JavaScript的核心。它描述了語言的基本語法和數據類型,ECMAScript是一套標準,定義了一種語言的標準,它與具體實現無關。 **BOM** BOM(Browser Object Model)其實是一套操作瀏覽器功能的API,通過BOM可以操作瀏覽器窗口,比如:彈出框、控制瀏覽器跳轉、獲取分辨率等 。 **DOM** DOM(Document Object Model)其實是一套操作頁面元素的API,JavaScript中的DOM把HTML看做是文檔樹,通過DOM提供的API可以對樹上的節點進行操作。 *****
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