JSCapture一个基于纯 JavaScript与HTML5实现的截屏库。
它可以让你从浏览器做您在桌面的截图和视频录制。JSCapture使用getUserMedia捕获屏幕。目前的屏幕捕捉API仅支持通过谷歌Chrome，和实际标志的Canary与Chromium。

API

• JSCapture.capture(config) - Captures a new screenshot.
  • config.x - (Number) default value 0. Specifies the left offset.
  • config.y - (Number) default value 0. Specifies the top offset.
  • config.width - (Number) default value the screen width. Specifies the width of the screenshot.
  • config.height - (Number) default value the screen height. Specifies the height of the screenshot.
  • config.process - (Function|Array) default value an empty array. A list of filters, which are going to process the image.
  • config.done - (Function) default value is undefined. Callback, which is being called with the captured image.
  • config.fail - (Function) default value is undefined. A callback, which is being executed on unsuccessful screen capturing (for example if the user does not allow screen capturing).
  • config.delay - (Number) default value 0. Specifies the delay after each the screenshot will be captured.
• JSCapture.record(config) - Capture a video.
  • config.x - (Number) default value 0. Specifies the left offset.
  • config.y - (Number) default value 0. Specifies the top offset.
  • config.width - (Number) default value the screen width. Specifies the width of the video.
  • config.height - (Number) default value the screen height. Specifies the height of the video.
  • config.process - (Function|Array) default value an empty array. A list of filters, which are going to process the individual frames.
  • config.done - (Function) default value is undefined. Callback, which is being called with the captured video.
  • config.delay - (Number) default value 0. Specifies the delay after each the video will be captured.
  • config.frameRate - (Number) default value 60 frames per second. Specifies the number of frames per second.
  • config.done - (Function) default value is undefined. A callback, which accepts the video (as a Blob), result of the screen recording, as an argument
  • config.fail - (Function) default value is undefined. A callback, which is being executed on unsuccessful screen recording (for example if the user does not allow screen capturing).
  • config.duration - (Number) default is Infinity. A number which indicates the length of the video.
• JSCapture.stopRecording(fn) - Stops the video recording.
  • fn - (Function) default value is undefined. A callback, which accepts the video (as a Blob), result of the screen recording, as an argument. Note that the callback provided in config.done won't be invoked if JSCapture.stopRecording(fn) is called.
• JSCapture.isRecording() - (Boolean) Returns whether the screen recording have been started.

项目主页：http://www.open-open.com/lib/view/home/1400817809878