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<script>
//判断浏览器是否支持HTML5 Canvas
window.onload = function () {
try {
//动态创建一个canvas元素，并获取他2Dcontext。如果出现异常则表示不支持
document.createElement("canvas").getContext("2d");
document.getElementById("support").innerHTML = "浏览器支持HTML5 CANVAS";
}
catch (e) {
document.getElementById("support").innerHTML = "浏览器不支持HTML5 CANVAS";
}
};
//这段代码主要是获取摄像头的视频流并显示在Video标签中
window.addEventListener("DOMContentLoaded", function () {
var canvas = document.getElementById("canvas"),
context = canvas.getContext("2d"),
video = document.getElementById("video"),
videoObj = { "video": true },
errBack = function (error) {
console.log("Video capture error: ", error.code);
};
//navigator.getUserMedia这个写法在Opera中好像是navigator.getUserMedianow
if (navigator.getUserMedia) {
navigator.getUserMedia(videoObj, function (stream) {
video.src = stream;
video.play();
}, errBack);
} else if (navigator.webkitGetUserMedia) {
navigator.webkitGetUserMedia(videoObj, function (stream) {
video.src = window.webkitURL.createObjectURL(stream);
video.play();
}, errBack);
}
//这个是拍照按钮的事件，
$("#snap").click(function () {
context.drawImage(video, 0, 0, 320, 320);
//CatchCode();
});
}, false);
//定时器
var interval = setInterval(CatchCode, "300");
//这个是无刷新上传图像的
function CatchCode() {
$("#snap").click();//实际运用可不写，测试代码，因为单击拍照按钮就获取了当前图像，有其他用途
var canvans = document.getElementById("canvas"); //获取浏览器页面的画布对象
//以下开始编码数据
var imgData = canvans.toDataURL(); //将图像转换为base64数据
var base64Data = imgData.substr(22); //在前端截取22位之后的字符串作为图像数据
//开始异步上传
$.post("uploadImgCode.ashx", { "img": base64Data }, function (data, status) {
if (status == "success") {
if (data == "OK") {
alert("二维码已经解析");
}
else {
// alert(data);
}
}
else {
alert("数据上传失败");
}
}, "text");
}
</script>
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