注意：需要在 https 或者 localhost 下才能成功调起摄像头（如果是html使用file协议也能成功）
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>摄像头拍照</title>
</head>
<body>
<video id="video" width="300" height="300" controls>
</video>
<div>
<button id="capture">拍照</button>
</div>
<canvas id="canvas" width="480" height="320"></canvas>
<script src="https://cdn.bootcdn.net/ajax/libs/vConsole/3.11.0/vconsole.min.js"></script>
<script>
// var vConsole = new VConsole();
//访问用户媒体设备的兼容方法
function getUserMedia(constraints, success, error) {
if (navigator.mediaDevices.getUserMedia) {
//最新的标准API
navigator.mediaDevices.getUserMedia(constraints).then(success).catch(error);
} else if (navigator.webkitGetUserMedia) {
//webkit核心浏览器
navigator.webkitGetUserMedia(constraints, success, error)
} else if (navigator.mozGetUserMedia) {
//firfox浏览器
navigator.mozGetUserMedia(constraints, success, error);
} else if (navigator.getUserMedia) {
//旧版API
navigator.getUserMedia(constraints, success, error);
}
}
let video = document.getElementById('video');
let canvas = document.getElementById('canvas');
let context = canvas.getContext('2d');
function success(stream) {
//兼容webkit核心浏览器
let CompatibleURL = window.URL || window.webkitURL;
//将视频流设置为video元素的源
console.log(stream);
// video.src = CompatibleURL.createObjectURL(new Blob(stream));
video.srcObject = stream;
video.play();
}
function error(error) {
console.log(`访问用户媒体设备失败${error.name}, ${error.message}`);
console.log(error)
}
if (navigator.mediaDevices.getUserMedia || navigator.getUserMedia || navigator.webkitGetUserMedia || navigator
.mozGetUserMedia) {
//调用用户媒体设备, 访问摄像头
getUserMedia({
video: {
width: 300,
height: 300
}
}, success, error);
} else {
alert('不支持访问用户媒体');
}
document.getElementById('capture').addEventListener('click', function() {
context.drawImage(video, 0, 0, 480, 320);
})
</script>
</body>
</html>
vue 中使用
<template>
<div>
<video id="video" width="300" height="300" controls></video>
<div>
<button id="capture" @click="btnClick">拍照</button>
</div>
<canvas id="canvas" width="320" height="320"></canvas>
</div>
</template>
<script>
export default {
data() {
return {
video: null,
canvas: null,
context: null,
}
},
mounted() {
let video = document.getElementById('video');
let canvas = document.getElementById('canvas');
console.log(canvas)
let context = canvas.getContext('2d');
this.video = video
this.init()
this.canvas = canvas
this.context = context
},
methods: {
getUserMedia(constraints, successCallback, errorCallback) {
if (navigator.mediaDevices.getUserMedia) {
navigator.mediaDevices.getUserMedia(constraints).then(successCallback).catch(errorCallback);
} else if (navigator.webkitGetUserMedia) {
navigator.webkitGetUserMedia(constraints, successCallback, errorCallback)
} else if (navigator.mozGetUserMedia) {
navigator.mozGetUserMedia(constraints, successCallback, errorCallback);
} else if (navigator.getUserMedia) {
navigator.getUserMedia(constraints, successCallback, errorCallback);
}
},
successCallback(stream) {
console.log(stream);
console.log(this.video)
this.video.srcObject = stream;
this.video.play();
},
errorCallback(error) {
console.log(`访问用户媒体设备失败${error.name}, ${error.message}`);
console.log(error)
},
init() {
if (navigator.mediaDevices.getUserMedia || navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia) {
this.getUserMedia(
{
video: { width: 320, height: 320 },
},
this.successCallback,
this.errorCallback
);
} else {
alert('不支持访问用户媒体');
}
},
btnClick() {
this.context.drawImage(this.video, 0, 0, 320, 320);
}
}
}
</script>
<style>
</style>
uniapp h5端 使用
<template>
<view>
<video id="video" width="300" height="300" controls>
</video>
<div>
<button id="capture" @click="btnClick">拍照</button>
</div>
<canvas id="canvas" width="320" height="320"></canvas>
</view>
</template>
<script>
export default {
data() {
return {
video: null,
canvas: null,
context: null,
}
},
onReady() {
let video = document.getElementsByClassName('uni-video-video')[0]
let canvas = document.getElementsByTagName('canvas')[0]
console.log(canvas)
let context = canvas.getContext('2d');
this.video = video
this.init()
this.canvas = canvas
this.context = context
},
methods: {
getUserMedia(constraints, successCallback, errorCallback) {
if (navigator.mediaDevices.getUserMedia) {
navigator.mediaDevices.getUserMedia(constraints).then(successCallback).catch(errorCallback);
} else if (navigator.webkitGetUserMedia) {
navigator.webkitGetUserMedia(constraints, successCallback, errorCallback)
} else if (navigator.mozGetUserMedia) {
navigator.mozGetUserMedia(constraints, successCallback, errorCallback);
} else if (navigator.getUserMedia) {
navigator.getUserMedia(constraints, successCallback, errorCallback);
}
},
successCallback(stream) {
console.log(stream);
console.log(this.video)
this.video.srcObject = stream;
this.video.play();
},
errorCallback(error) {
console.log(`访问用户媒体设备失败${error.name}, ${error.message}`);
console.log(error)
},
init() {
if (navigator.mediaDevices.getUserMedia || navigator.getUserMedia || navigator.webkitGetUserMedia || navigator .mozGetUserMedia) {
this.getUserMedia(
{
video: { width: 320, height: 320 } ,
},
this.successCallback,
this.errorCallback
);
} else {
alert('不支持访问用户媒体');
}
},
btnClick() {
this.context.drawImage(this.video, 0, 0, 320, 320);
}
}
}
</script>
<style>
</style>
