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test2.html
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test2.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<input
type="button"
title="HTML5摄像头"
value="开启摄像头"
onclick="getMedia()"
/>
<video id="video" width="500px" height="500px" autoplay="autoplay"></video>
<canvas id="canvas" width="500px" height="500px"></canvas>
<button id="snap" onclick="takePhoto()">拍照</button>
<script>
function getMedia() {
alert(navigator.mediaDevices)
let constraints = {
//参数
video: { width: 500, height: 500 },
audio: true,
}
//获得video摄像头区域
let video = document.getElementById('video')
//返回的Promise对象
let promise = navigator.mediaDevices.getUserMedia(constraints)
//then()异步,调用MediaStream对象作为参数
promise.then(function (MediaStream) {
video.srcObject = MediaStream
video.play()
})
}
function takePhoto() {
//获得Canvas对象
let video = document.getElementById('video')
let canvas = document.getElementById('canvas')
let ctx = canvas.getContext('2d')
//绘图
ctx.drawImage(video, 0, 0, 300, 300)
}
</script>
</body>
</html>