我正在编写一个Firefox扩展程序，希望用户能够使用本地图像更改网页上的图像。使用JavaScript可否更改图像源为用户计算机上保存的图像？
如果您需要更多信息，请告诉我。谢谢。
你可以将图像的SRC设置为“file：//” URI，或者任何其他字符串。但是获取路径可能会更加困难 - 你必须使用浏览器的内部机制来获取路径。
当然，从网页Javascript 来说这是完全不可能的，但是扩展程序的沙箱比页面弱得多，您可以对文件系统做很多事情，因此建议这是不可能的答案是明显错误的。
我认为这篇黑客文章对于最近的HTML5功能工作中支持访问本地文件有一些有用的信息。
http://hacks.mozilla.org/ 201002/an-html5-offline-image-editor-and-uploader-application/
我不确定直接使用本地文件作为图像，但最差的情况下，使用展示的技术，您可以创建一个数据URL来代替使用。
出于安全目的，JavaScript 无法访问本地文件系统。您的插件将不得不解决这个问题。
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