html5调用摄像头实现拍照并本地保存

来源：互联网发布：淘宝女装店招图片编辑：程序博客网时间：2024/05/21 09:50

这是本人从网上搜索的知识点进行整理综合得到的，有些地方自己都不是太明白！但是可以用！

<!--注意：该代码一定要放到服务器中去访问才可以看到效果，并且使用谷歌浏览器，其他浏览器我使用的是不行的不知道为什么--><!DOCTYPE html><html><head><meta charset="gbk"><meta name="viewport" content="width=device-width, initial-scale=1"><title>html5调用摄像头实现拍照本地保存</title></head><body><video id="video" autoplay=""style='width:640px;height:480px'></video><button id="paizhao">拍照</button> <button onClick="saveFile(filename);" type="button">下载图片</button><canvas id="canvas" width="640" height="480"></canvas><script type="text/javascript">var video=document.getElementById("video");var context=canvas.getContext("2d");var errocb=function(){console.log("sth srong");}//调用电脑摄像头并将画面显示在网页if(navigator.getUserMedia){navigator.getUserMedia({"video":true},function(stream){video.src=stream;video.play();},errocb);}else if(navigator.webkitGetUserMedia){navigator.webkitGetUserMedia({"video":true},function(stream){video.src=window.webkitURL.createObjectURL(stream);video.play();},errocb);}//利用canvas 将当前video的画面画到canvas标签节点中document.getElementById("paizhao").addEventListener("click",function(){context.drawImage(video,0,0,640,480);});//下面的代码是保存canvas标签里的图片并且将其按一定的规则重命名var type = 'png';var _fixType = function(type) {    type = type.toLowerCase().replace(/jpg/i, 'jpeg');    var r = type.match(/png|jpeg|bmp|gif/)[0];    return 'image/' + r;};/** * @param  {String} filename 文件名 */var saveFile = function(filename){//获取canvas标签里的图片内容var imgData = document.getElementById('canvas').toDataURL(type);imgData = imgData.replace(_fixType(type),'image/octet-stream');    var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a');    save_link.href = imgData;    save_link.download = filename;       var event = document.createEvent('MouseEvents');    event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);    save_link.dispatchEvent(event);};   // 下载后的文件名规则var filename = (new Date()).getTime() + '.' + type;</script></body></html>

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