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HomeWeb Front-endH5 Tutorial用 HTML5 可以实现二维码扫描识别的功能吗?

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答案是可以。
实现基本步骤:
  1. 操作摄像头,获取图片。
    技术要点:MediaStream、GetUserMedia、File api。
  2. 利用canvas使用相关算法分析图片识别图片得出结果。
    技术要点:getImageData

* 涉及到的技术点浏览器们(包括移动端)支持各异,现阶段要开发并投产还不太现实。比如MediaStream的支持情况:caniuse.com/#
* 识别算法是一个难点,不过谢谢github,谢谢开源社区,@Shou Jiesong 的答案中有phonegap的插件地址,支持各种码。 如果是使用phonegap的话,可以使用barcode plugin github.com/phonegap/pho HTML5 是markup language,不能做任何数据处理。如果要做条形码读取,要使用javascript或PHP.
附上javascript版的barcode scanner.
badassjs.com/post/65433 html5 并没有增加image 解码扩展功能, 可能需要后台配合实现decode qrcode image.
不过有一个项目LazarSoft/jsqrcode 路 GitHub
使用纯javascript来解码图片, 自己尝试下吧. 可以的,这两个页面就是使用了 webcam 扫描二维码:
webqr.com/
the-qrcode-generator.com 如果想静态扫描的话前面各位已经回复了很多。

补充一下实时扫描这块,由于iOS目前强制浏览器使用苹果自己的webKit内核,所有iOS的浏览器都不支持getUserMedia,所以基于web的实时扫描是做不到的,具体要看苹果什么时候出替代方案了。

developer.apple.com/app
2.17 Apps that browse the web must use the iOS WebKit framework and WebKit Javascript

Is WebRTC ready yet? 可以在线识别出来的,可以看这里 二维码在线扫描器,二维码在线解码安全检测 就是用的JS和html解析的,但只能在支持html5的浏览器上使用的。
需要用到的几点技术,楼上也说了的
1.fileread读取本地二维码图片信息,构造一个 input[type=file]
2.canvas绘图计算,getImageData信息,然后对信息进行处理
3.canvas离屏技术。

最重要的,是qrdecode的算法,引用的github的开源项目。 LazarSoft/jsqrcode · GitHub

把里面的JS合并,结合canvas就可以使用了。具体的可以看下我上面给的一个案例! 可以识别的。具体看工具:在线二维码内容识别 代码是js,所以你就用console看吧,没有混淆~

最新修改,做成了chrome浏览器插件。名字叫‘极简二维码’,在插件市场搜索一下即可体验… 可以试试这上面的API模块:jingshiba.com/BarcodeGe
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