使用HTML5拍照示例代码_html5教程技巧

Snap Photo

// 设置事件监听，DOM内容加载完成，和jQuery的$.ready() 效果差不多。
window.addEventListener("DOMContentLoaded", function() {
// canvas 元素将用于抓拍
var canvas = document.getElementById("canvas"),
context = canvas.getContext("2d"),
// video 元素，将用于接收并播放摄像头 的数据流
video = document.getElementById("video"),
videoObj = { "video": true },
// 一个出错的回调函数，在控制台打印出错信息
errBack = function(error) {
if("object" === typeof window.console){
console.log("Video capture error: ", error.code);
}
};
// Put video listeners into place
// 针对标准的浏览器
if(navigator.getUserMedia) { // Standard
navigator.getUserMedia(videoObj, function(stream) {
video.src = stream;
video.play();
}, errBack);
} else if(navigator.webkitGetUserMedia) { // WebKit-prefixed
navigator.webkitGetUserMedia(videoObj, function(stream){
video.src = window.webkitURL.createObjectURL(stream);
video.play();
}, errBack);
}
// 对拍照按钮的事件监听
document.getElementById("snap").addEventListener("click", function() {
// 画到画布上
context.drawImage(video, 0, 0, 640, 480);
});
}, false);

<script> <br />// 设置事件监听，DOM内容加载完成，和jQuery的$.ready() 效果差不多。 <br />window.addEventListener("DOMContentLoaded", function() { <br />// canvas 元素将用于抓拍 <br />var canvas = document.getElementById("canvas"), <br />context = canvas.getContext("2d"), <br />// video 元素，将用于接收并播放摄像头 的数据流 <br />video = document.getElementById("video"), <br />videoObj = { "video": true }, <br />// 一个出错的回调函数，在控制台打印出错信息 <br />errBack = function(error) { <br />if("object" === typeof window.console){ <br />console.log("Video capture error: ", error.code); <br />} <br />}; <br />// Put video listeners into place <br />// 针对标准的浏览器 <br />if(navigator.getUserMedia) { // Standard <br />navigator.getUserMedia(videoObj, function(stream) { <br />video.src = stream; <br />video.play(); <br />}, errBack); <br />} else if(navigator.webkitGetUserMedia) { // WebKit-prefixed <br />navigator.webkitGetUserMedia(videoObj, function(stream){ <br />video.src = window.webkitURL.createObjectURL(stream); <br />video.play(); <br />}, errBack); <br />} <br />// 对拍照按钮的事件监听 <br />document.getElementById("snap").addEventListener("click", function() { <br />// 画到画布上 <br />context.drawImage(video, 0, 0, 640, 480); <br />}); <br />}, false); <br /></script>