<template>
<div class="camera_outer">
<video id="videoCamera" :width="videoWidth" :height="videoHeight" autoplay></video>
<canvas style="display: none" id="canvasCamera" :width="videoWidth" :height="videoHeight"></canvas>
<div v-if="imgSrc" class="img_bg_camera">
<p>效果预览</p>
<img :src="imgSrc" alt class="tx_img" />
</div>
<div class="button">
<el-button @click="getCompetence()" type="primary">打开摄像头</el-button>
<el-button @click="stopNavigator()" type="warning">关闭摄像头</el-button>
<el-button @click="setImage()" type="success">拍照</el-button>
</div>
</div>
</template>
<script>
export default {
data() {
return {
videoWidth: 250,
videoHeight: 350,
imgSrc: "",
thisCancas: null,
thisContext: null,
thisVideo: null,
openVideo: false,
};
},
mounted() {
this.getCompetence(); //进入页面就调用摄像头
},
methods: {
// 调用权限(打开摄像头功能)
getCompetence() {
var _this = this;
_this.thisCancas = document.getElementById("canvasCamera");
_this.thisContext = this.thisCancas.getContext("2d");
_this.thisVideo = document.getElementById("videoCamera");
_this.thisVideo.style.display = "block";
// 获取媒体属性,旧版本浏览器可能不支持mediaDevices,我们首先设置一个空对象
if (navigator.mediaDevices === undefined) {
navigator.mediaDevices = {};
}
// 一些浏览器实现了部分mediaDevices,我们不能只分配一个对象
// 使用getUserMedia,因为它会覆盖现有的属性。
// 这里,如果缺少getUserMedia属性,就添加它。
if (navigator.mediaDevices.getUserMedia === undefined) {
navigator.mediaDevices.getUserMedia = function (constraints) {
// 首先获取现存的getUserMedia(如果存在)
var getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.getUserMedia;
// 有些浏览器不支持,会返回错误信息
// 保持接口一致
if (!getUserMedia) {
//不存在则报错
return Promise.reject(
new Error("getUserMedia is not implemented in this browser")
);
}
// 否则,使用Promise将调用包装到旧的navigator.getUserMedia
return new Promise(function (resolve, reject) {
getUserMedia.call(navigator, constraints, resolve, reject);
});
};
}
var constraints = {
audio: false,
video: {
width: this.videoWidth,
height: this.videoHeight,
transform: "scaleX(-1)",
},
};
navigator.mediaDevices.getUserMedia(constraints).then(function (stream) {
// 旧的浏览器可能没有srcObject
if ("srcObject" in _this.thisVideo) {
_this.thisVideo.srcObject = stream;
} else {
// 避免在新的浏览器中使用它,因为它正在被弃用。
_this.thisVideo.src = window.URL.createObjectURL(stream);
}
_this.thisVideo.onloadedmetadata = function (e) {
_this.thisVideo.play();
};
}).catch((err) => {
console.log(err);
});
},
// 绘制图片(拍照功能)
setImage() {
var _this = this;
// canvas画图
_this.thisContext.drawImage(
_this.thisVideo,
0,
0,
_this.videoWidth,
_this.videoHeight
);
// 获取图片base64链接
var image = this.thisCancas.toDataURL("image/png");
_this.imgSrc = image; //赋值并预览图片
},
// 关闭摄像头
stopNavigator() {
this.thisVideo.srcObject.getTracks()[0].stop();
},
// base64转文件,此处没用到
dataURLtoFile(dataurl, filename) {
var arr = dataurl.split(",");
var mime = arr[0].match(/:(.*?);/)[1];
var bstr = atob(arr[1]);
var n = bstr.length;
var u8arr = new Uint8Array(n);
while (n--) {
u8arr[n] = bstr.charCodeAt(n);
}
return new File([u8arr], filename, { type: mime });
},
},
};
</script>
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文章来源:https://www.toymoban.com/news/detail-820452.html
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