什么是Bookmarklet？简单地说，就是把一段特定功能的JavaScript代码保存至收藏夹，当你需要的时候点击这个收藏快捷方式，实现这段JavaScript代码的功能。因为现在的浏览器地址栏都支持JavaScript，所以使用Bookmarklet可以方便的实现你常用到的功能。

在Wikipedia上是这样的解释：

A bookmarklet is an applet, a small computer application, stored as the URL of a bookmark in a web browser or as a hyperlink on a web page. Whether bookmarklet utilities are stored as bookmarks or hyperlinks, they are designed to add one-click functionality to a browser or web page. When clicked, a bookmarklet performs some function, one of a wide variety such as a search query or data extraction. Usually the applet is a JavaScript program.

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Tags: Bookmarklet, Browser, Firefox, JavaScript, ToolBar