{"id":752,"date":"2023-09-27T16:10:57","date_gmt":"2023-09-27T08:10:57","guid":{"rendered":"http:\/\/www.inhhh.com\/blog\/?p=752"},"modified":"2023-09-27T16:10:57","modified_gmt":"2023-09-27T08:10:57","slug":"js-%e8%b0%83%e7%94%a8%e6%91%84%e5%83%8f%e5%a4%b4%e5%ae%9e%e7%8e%b0%e6%8b%8d%e7%85%a7-%e8%bd%ac%e8%bd%bd","status":"publish","type":"post","link":"http:\/\/www.inhhh.com\/blog\/?p=752","title":{"rendered":"js \u8c03\u7528\u6444\u50cf\u5934\u5b9e\u73b0\u62cd\u7167 \u8f6c\u8f7d"},"content":{"rendered":"\n<p>mediaDevices getUserMedia<br>\u8c03\u7528\u6444\u50cf\u5934<\/p>\n\n\n\n<p>\u6838\u5fc3\u65b9\u6cd5 Window.navigator.mediaDevices.getUserMedia()<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>Window.navigator \u4f1a\u8fd4\u56de\u4e00\u4e2a Navigator \u5bf9\u8c61\u7684\u5f15\u7528\uff0c\u53ef\u4ee5\u7528\u4e8e\u8bf7\u6c42\u8fd0\u884c\u5f53\u524d\u4ee3\u7801\u7684\u5e94\u7528\u7a0b\u5e8f\u7684\u76f8\u5173\u4fe1\u606f\u3002<br>navigator.mediaDevices\u8be5\u5bf9\u8c61\u63d0\u4f9b\u8bbf\u95ee\u8fde\u63a5\u5a92\u4f53\u8f93\u5165\u7684\u8bbe\u5907\uff0c\u5982\u7167\u76f8\u673a\u548c\u9ea6\u514b\u98ce\uff0c\u4ee5\u53ca\u5c4f\u5e55\u5171\u4eab\u7b49\u3002\u5b83\u53ef\u4ee5\u4f7f\u4f60\u53d6\u5f97\u4efb\u4f55\u786c\u4ef6\u8d44\u6e90\u7684\u5a92\u4f53\u6570\u636e\u3002<br>getUserMedia(constraints) \u4f1a\u63d0\u793a\u7528\u6237\u7ed9\u4e88\u4f7f\u7528\u5a92\u4f53\u8f93\u5165\u7684\u8bb8\u53ef\uff0c\u5a92\u4f53\u8f93\u5165\u4f1a\u4ea7\u751f\u4e00\u4e2aMediaStream\uff0c\u91cc\u9762\u5305\u542b\u4e86\u8bf7\u6c42\u7684\u5a92\u4f53\u7c7b\u578b\u7684\u8f68\u9053\u3002\u6b64\u6d41\u53ef\u4ee5\u5305\u542b\u4e00\u4e2a\u89c6\u9891\u8f68\u9053\u3001\u4e00\u4e2a\u97f3\u9891\u8f68\u9053\uff0c\u4e5f\u53ef\u80fd\u662f\u5176\u5b83\u8f68\u9053\u7c7b\u578b\u3002<br>navigator \u8be6\u7ec6\u8bf4\u660e \u00a0MDN-navigator<br>mediaDevices \u8be6\u7ec6\u8bf4\u660e \u00a0MDN-mediaDevices<br>getUserMedia \u8be6\u7ec6\u8bf4\u660e\u00a0MDN-getUserMedia<br>constraints \u89c6\u9891\u8f68\u9053\u7684\u914d\u7f6e\u8bf4\u660e \u00a0MDN-Constraints<\/p>\n\n\n\n<p><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let constraints={\r\n  audio: false, \/\/\u97f3\u9891\u8f68\u9053\r\n  video: true  \/\/\u89c6\u9891\u8f68\u9053\r\n}\r\nlet mediaPromise = navigator.mediaDevices.getUserMedia(constraints);\r\nmediaPromise..then(function(stream) {\r\n  \/* \u4f7f\u7528\u8fd9\u4e2astream stream *\/\r\n})\r\n.catch(function(err) {\r\n  \/* \u5904\u7406error *\/\r\n});<\/code><\/pre>\n\n\n\n<p>\u754c\u9762\u5c55\u793a\u6444\u50cf\u5934\u5f55\u5236\u7684\u4fe1\u606f\uff0c\u754c\u9762\u4e2d\u9700\u8981\u6dfb\u52a0 video\u6807\u7b7e\uff0c\u5c06\u83b7\u53d6\u5230\u7684 stream \u8d4b\u503c\u5230 video \u4e2d\uff1b<\/p>\n\n\n\n<p><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let constraints={\r\n  audio: true, \/\/\u97f3\u9891\u8f68\u9053\r\n  video: true  \/\/\u89c6\u9891\u8f68\u9053\r\n};\r\nlet srcVideo=document.querySelector('video.src-video');\r\nlet mediaPromise = navigator.mediaDevices.getUserMedia(constraints);\r\nmediaPromise..then(function(stream) {\r\n  \/* \u4f7f\u7528\u8fd9\u4e2astream stream *\/\r\n  srcVideo.srcObject=stream;\r\n  srcVideo.play();\r\n})\r\n.catch(function(err) {\r\n  \/* \u5904\u7406error *\/\r\n});\r\n<\/code><\/pre>\n\n\n\n<p>\u62cd\u7167<\/p>\n\n\n\n<p>\u62cd\u7167\u5b9e\u73b0\u903b\u8f91<\/p>\n\n\n\n<p>\u83b7\u53d6 srcVideo\u5143\u7d20\uff0c\u83b7\u53d6\u9700\u8981\u62cd\u7167\u7684\u6570\u636e\uff1b<br>\u83b7\u53d6 canvas\u5143\u7d20\uff0c\u6839\u636esrcVideo\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u56fe\u7247\u7ed8\u5236 ctx.drawImage()\uff1b<br>\u5c06 canvas\u7ed8\u5236\u7684\u56fe\u7247\u4fe1\u606f\uff0c\u5c55\u793a\u5728 img\u6807\u7b7e\u4e2d\uff1b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u83b7\u53d6 `srcVideo`\u5143\u7d20\uff0c\u83b7\u53d6\u9700\u8981\u62cd\u7167\u7684\u6570\u636e\uff1b\r\nlet srcVideo=document.querySelector('video.src-video');\r\nlet canvas = document.getElementById('canvas');\r\n\/\/\u83b7\u53d6 `canvas`\u5143\u7d20\uff0c\u6839\u636e`srcVideo`\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u56fe\u7247\u7ed8\u5236 `ctx.drawImage()`\uff1b\r\nlet ctx = canvas.getContext('2d');\r\nctx.drawImage(srcVideo, 0, 0, 500, 500);\r\n\/\/\u5c06 `canvas`\u7ed8\u5236\u7684\u56fe\u7247\u4fe1\u606f\uff0c\u5c55\u793a\u5728 `img`\u6807\u7b7e\u4e2d\uff1b\r\nlet photo=document.querySelector('img.photo');\r\nphoto.src=canvas.toDataURL();\r\n<\/code><\/pre>\n\n\n\n<p>\u62cd\u7167\u5b8c\u6574\u4ee3\u7801<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!DOCTYPE html>\r\n&lt;html lang=\"zh\">\r\n\r\n&lt;head>\r\n    &lt;meta charset=\"UTF-8\">\r\n    &lt;meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">\r\n    &lt;meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\r\n    &lt;title>\u62cd\u7167&lt;\/title>\r\n&lt;\/head>\r\n\r\n&lt;body>\r\n    &lt;button onclick=\"openMedia()\" >\u5f00\u542f\u6444\u50cf\u5934&lt;\/button>\r\n    &lt;button onclick=\"takePhoto()\" >\u62cd\u7167&lt;\/button>&lt;br\/>&lt;br\/>\r\n    &lt;video style=\"display: none;\" class=\"src-video\" width=\"500px\" height=\"500px\" autoplay=\"autoplay\">&lt;\/video>\r\n    &lt;canvas id=\"canvas\" width=\"500px\" height=\"500px\" style=\"display: none;\">&lt;\/canvas>\r\n    &lt;img src=\"\" alt=\"\" class=\"photo\">\r\n&lt;\/body>\r\n&lt;script>\r\n    let srcVideo = document.querySelector('video.src-video');\r\n    let mediaStream;\r\n    let photo=document.querySelector('img.photo');\r\n    \/\/ \u5f00\u542f\u6444\u50cf\u5934\r\n    let openMedia = function () {\r\n        photo.src='';\r\n        srcVideo.style.display='block';\r\n        let constraints = {\r\n            audio: false, \/\/\u97f3\u9891\u8f68\u9053\r\n            video: {width:500,height:500}  \/\/\u89c6\u9891\u8f68\u9053\r\n        }\r\n        let mediaPromise = navigator.mediaDevices.getUserMedia(constraints);\r\n        mediaPromise.then(function (stream) {\r\n            \/* \u4f7f\u7528\u8fd9\u4e2astream stream *\/\r\n            mediaStream=stream;\r\n            srcVideo.srcObject = stream;\r\n            srcVideo.play();\r\n        }).catch(function (err) {\r\n            \/* \u5904\u7406error *\/\r\n            alert(err);\r\n        });\r\n    };\r\n\r\n    \/\/ \u62cd\u7167\r\n    let takePhoto=function(){\r\n        let canvas = document.querySelector('#canvas');\r\n        \/\/\u83b7\u53d6 `canvas`\u5143\u7d20\uff0c\u6839\u636e`srcVideo`\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u56fe\u7247\u7ed8\u5236 `ctx.drawImage()`\uff1b\r\n        let ctx = canvas.getContext('2d');\r\n        ctx.drawImage(srcVideo, 0, 0, 500, 500);\r\n        \/\/\u5c06 `canvas`\u7ed8\u5236\u7684\u56fe\u7247\u4fe1\u606f\uff0c\u5c55\u793a\u5728 `img`\u6807\u7b7e\u4e2d\uff1b\r\n        photo.src=canvas.toDataURL();\r\n        closeMedia();\r\n    };\r\n\r\n    \/\/ \u5173\u95ed\u6444\u50cf\u5934\r\n    let closeMedia=function(){\r\n        mediaStream.getTracks().forEach(track => {\r\n            track.stop();\r\n        });\r\n        srcVideo.style.display='none';\r\n    }\r\n\r\n&lt;\/script>\r\n&lt;\/html>\r\n<\/code><\/pre>\n\n\n\n<p><br><br><video width=\"500px\" height=\"500px\" autoplay=\"autoplay\"> <canvas width=\"500px\" height=\"500px\"> <img decoding=\"async\" src=\"\" alt=\"\"><\/canvas><\/video><\/p>\n","protected":false},"excerpt":{"rendered":"<p>mediaDevices getUserMedia\u8c03\u7528\u6444\u50cf\u5934 \u6838\u5fc3\u65b9\u6cd5 Window.navigator.me<\/p>\n<div class=\"more-link\">\n\t\t\t\t <a href=\"http:\/\/www.inhhh.com\/blog\/?p=752\" class=\"link-btn theme-btn\"><span>Read More <\/span> <i class=\"fa fa-caret-right\"><\/i><\/a>\n\t\t\t<\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-752","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/752","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=752"}],"version-history":[{"count":1,"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/752\/revisions"}],"predecessor-version":[{"id":753,"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/752\/revisions\/753"}],"wp:attachment":[{"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=752"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=752"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=752"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}