<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">
<img :src="imgSrc" alt="" class="tx_img"/>
</div>
<el-button @click="getCompetence">打開攝像頭</el-button>
<el-button @click="stopNavigator">關(guān)閉攝像頭</el-button>
<el-button @click="setImage">拍照</el-button>
</div>
</template>
<script>
export default {
name: "CameraVideo",
data() {
return {
videoWidth: 600,
videoHeight: 600,
imgSrc: "",
thisCanvas: null,
thisContext: null,
thisVideo: null
}
},
mounted() {
this.getCompetence()
},
methods: {
// 調(diào)用權(quán)限(打開攝像頭功能)
getCompetence() {
var _this = this;
this.thisCanvas = document.getElementById("canvasCamera");
this.thisContext = this.thisCanvas.getContext("2d");
this.thisVideo = document.getElementById("videoCamera");
// 舊版本瀏覽器可能根本不支持mediaDevices扮叨,我們首先設(shè)置一個(gè)空對(duì)象
if (window.navigator.mediaDevices === undefined) {
window.navigator.mediaDevices = {};
}
// 一些瀏覽器實(shí)現(xiàn)了部分mediaDevices,我們不能只分配一個(gè)對(duì)象
// 使用getUserMedia领迈,因?yàn)樗鼤?huì)覆蓋現(xiàn)有的屬性彻磁。
// 這里碍沐,如果缺少getUserMedia屬性,就添加它衷蜓。
if (window.navigator.mediaDevices.getUserMedia === undefined) {
window.navigator.mediaDevices.getUserMedia = (constraints) => {
// 首先獲取現(xiàn)存的getUserMedia(如果存在)
var getUserMedia =
window.navigator.webkitGetUserMedia ||
window.navigator.mozGetUserMedia ||
window.navigator.getUserMedia;
// 有些瀏覽器不支持累提,會(huì)返回錯(cuò)誤信息
// 保持接口一致
if (!getUserMedia) {
return Promise.reject(
new Error("getUserMedia is not implemented in this browser")
);
}
// 否則,使用Promise將調(diào)用包裝到舊的navigator.getUserMedia
return new Promise(function (resolve, reject) {
getUserMedia.call(window.navigator, constraints, resolve, reject);
});
};
}
var constraints = {
audio: false,
video: {
width: this.videoWidth,
height: this.videoHeight,
transform: "scaleX(-1)",
},
};
window.navigator.mediaDevices
.getUserMedia(constraints)
.then(function (stream) {
// 舊的瀏覽器可能沒有srcObject
if ("srcObject" in _this.thisVideo) {
_this.thisVideo.srcObject = stream;
} else {
// 避免在新的瀏覽器中使用它磁浇,因?yàn)樗诒粭売谩? _this.thisVideo.src = window.URL.createObjectURL(stream);
}
_this.thisVideo.onloadedmetadata = function (e) {
_this.thisVideo.play();
};
})
.catch((err) => {
console.log(err);
});
},
// 繪制圖片(拍照功能)
setImage() {
var _this = this;
// 點(diǎn)擊斋陪,canvas畫圖
_this.thisContext.drawImage(
_this.thisVideo,
0,
0,
_this.videoWidth,
_this.videoHeight
);
// 獲取圖片base64鏈接
var image = this.thisCanvas.toDataURL("image/png");
_this.imgSrc = image;
this.$emit("refreshDataList", this.imgSrc);
},
// base64轉(zhuǎn)文件
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});
},
// 關(guān)閉攝像頭
stopNavigator() {
this.thisVideo.srcObject.getTracks()[0].stop();
}
}
}
</script>
<style scoped lang="scss">
.camera_outer {
position: relative;
overflow: hidden;
background-size: 100%;
video,
canvas,
.tx_img {
-moz-transform: scaleX(-1);
-webkit-transform: scaleX(-1);
-o-transform: scaleX(-1);
transform: scaleX(-1);
border: 1px solid #ccc;
}
.btn_camera {
position: absolute;
bottom: 4px;
left: 0;
right: 0;
height: 50px;
background-color: rgba(0, 0, 0, 0.3);
line-height: 50px;
text-align: center;
color: #ffffff;
}
.bg_r_img {
position: absolute;
bottom: 0;
left: 0;
right: 0;
top: 0;
}
.img_bg_camera {
position: absolute;
right: 0;
top: 0;
img {
width: 300px;
height: 300px;
}
.img_btn_camera {
position: absolute;
bottom: 0;
left: 0;
right: 0;
height: 50px;
line-height: 50px;
text-align: center;
background-color: rgba(0, 0, 0, 0.3);
color: #ffffff;
.loding_img {
width: 50px;
height: 50px;
}
}
}
}
</style>
但是這里會(huì)出現(xiàn)一個(gè)報(bào)錯(cuò)信息: getUserMedia is not implemented in this browser
這個(gè)錯(cuò)誤信息怎么處理呢, 有兩種方案一種是生產(chǎn)環(huán)境, 一種是開發(fā)環(huán)境:
- 將http協(xié)議換成https協(xié)議訪問網(wǎng)站(生產(chǎn)環(huán)境)
- 瀏覽器內(nèi)核指定白名單(開發(fā)環(huán)境):
//在谷歌瀏覽器內(nèi)輸入url
chrome://flags/#unsafely-treat-insecure-origin-as-secure
輸入完后照下圖輸入我們要設(shè)置的白名單域名選擇 Enabled 重啟瀏覽器就可以了