微信浏览器不支持直接调用摄像头拍照了。
如果要拍照上传,参考 js-sdk
http://qydev.weixin.qq.com/wiki/index.php?title=%E5%BE%AE%E4%BF%A1JS-SDK%E6%8E%A5%E5%8F%A3#.E6.8B.8D.E7.85.A7.E6.88.96.E4.BB.8E.E6.89.8B.E6.9C.BA.E7.9B.B8.E5.86.8C.E4.B8.AD.E9.80.89.E5.9B.BE.E6.8E.A5.E5.8F.A3
http://www.foxtable.com/bbs/dispbbs.asp?boardid=2&id=100473&authorid=0&page=0&star=2