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Detailed explanation of the steps to call the local camera function using JS

php中世界最好的语言Original: 2018-05-23 10:13:182623browse

This time I will bring you a detailed explanation of the steps for calling the local camera function with JS. What are the precautions for calling the local camera function with JS. The following is a practical case, let's take a look.

Today I learned about using js to call a local camera. In fact, it is not very troublesome to implement. The following is the code part. Connect to the Tomcat server, and then open it on the web page to see the effect. . Come and have some fun!

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title></title>
<style>
video {
 border: 1px solid #ccc;
 display: block;
 margin: 0 0 20px 0;
 float:left;
}
canvas {
 margin-top: 20px;
 border: 1px solid #ccc;
 display: block;
}
</style>
</head>
<body>
<video width="640" height="480" id="myVideo"></video>
<canvas width="640" height="480" id="myCanvas"></canvas>
<button id="myButton">截图</button>
<button id="myButton2">预览</button>
<button id="myButton3">
<a download="video.png">另存为</a>
</button>
</body>
<script>
window.addEventListener('DOMContentLoaded',function(){
var cobj=document.getElementById('myCanvas').getContext('2d');
var vobj=document.getElementById('myVideo');
getUserMedia({video:true},function(stream){
vobj.src=stream;
vobj.play();
},function(){});
document.getElementById('myButton').addEventListener('click',function(){
cobj.drawImage(vobj,0,0,640,480);
document.getElementById('myButton3').children[0].href=cobj.canvas.toDataURL("image/png");
},false);
document.getElementById('myButton2').addEventListener('click',function(){
window.open(cobj.canvas.toDataURL("image/png"),'_blank');
},false);
},false);
function getUserMedia(obj,success,error){
if(navigator.getUserMedia){
getUserMedia=function(obj,success,error){
navigator.getUserMedia(obj,function(stream){
success(stream);
},error);
}
}else if(navigator.webkitGetUserMedia){
getUserMedia=function(obj,success,error){
navigator.webkitGetUserMedia(obj,function(stream){
var _URL=window.URL || window.webkitURL;
success(_URL.createObjectURL(stream));
},error);
}
}else if(navigator.mozGetUserMedia){
getUserMedia=function(obj,success,error){
navigator.mozGetUserMedia(obj,function(stream){
success(window.URL.createObjectURL(stream));
},error);
}
}else{
return false;
}
return getUserMedia(obj,success,error);
}
</script>
</html>

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Detailed explanation of the steps to call the local camera function using JS

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