js调用网络摄像头的方法
不支持IE浏览器(需要使用flash插件),支持移动端,未经过完全测试
PC端使用的时候,HTML页面需要预留video标签,canvas标签
移动端使用的时候,HTML页面需要预留file标签,canvas标签,img标签
(function(window,document){
window.camera={
init:function(options){
/**
*options属性示例
*videoID:video控件ID
*canvasID:canvas控件ID
*fileID:type为file的input控件的ID
*imageID:img控件的ID
*videoEnable:是否启用摄像头
*audioEnable:是否启用麦克风
*videoWidth:视频宽度
*videoHeight:视频高度
*photoWidth:拍照宽度
*photoHeight:拍照高度
*/
_options=options;
if(isMobileTerminal()){
initMobileTerminal();
}else{
initComputerTerminal();
}
},
photo:function(){
if(isMobileTerminal()){
photoMobileTerminal();
}else{
photoComputerTerminal();
}
}
};
let_options=null;
functioninitComputerTerminal(){
letvideoDom=document.getElementById(_options.videoID);
if(!videoDom){
alert('Video控件无效');
return;
}
letcanvasDom=document.getElementById(_options.canvasID);
if(!canvasDom){
alert('Canvas控件无效');
return;
}
canvasDom.setAttribute('width',_options.photoWidth+'px');
canvasDom.setAttribute('height',_options.photoHeight+'px');
letparameters={
video:_options.videoEnable?{
width:_options.videoWidth,
height:_options.videoHeight
}:false,
audio:_options.audioEnable
};
navigator.mediaDevices.getUserMedia(parameters)
.then(function(MediaStream){
video.srcObject=MediaStream;
video.play();
}).catch(function(reason){
console.log(reason);
alert(reason);
});
}
functionphotoComputerTerminal(){
letvideoDom=document.getElementById(_options.videoID);
if(!videoDom){
alert('Video控件无效');
return;
}
letcanvasDom=document.getElementById(_options.canvasID);
if(!canvasDom){
alert('Canvas控件无效');
return;
}
letcontext=canvasDom.getContext('2d');
context.drawImage(videoDom,0,0,_options.photoWidth,_options.photoHeight);
}
functioninitMobileTerminal(){
letfileDom=document.getElementById(_options.fileID);
if(!fileDom){
alert('File控件无效');
return;
}
fileDom.setAttribute('accept','image/*');
fileDom.setAttribute('capture','camera');
letcanvasDom=document.getElementById(_options.canvasID);
if(!canvasDom){
alert('Canvas控件无效');
return;
}
canvasDom.setAttribute('width',_options.photoWidth+'px');
canvasDom.setAttribute('height',_options.photoHeight+'px');
letimageDom=document.getElementById(_options.imageID);
if(!imageDom){
alert('Image控件无效');
return;
}
fileDom.addEventListener('change',function(){
letfile=fileDom.files[0];
letreader=newFileReader();
reader.onloadend=function(){
imageDom.setAttribute('src',reader.result);
setTimeout(function(){
letcontext=canvas.getContext("2d");
context.drawImage(imageDom,0,0,_options.photoWidth,_options.photoHeight);
},300);
};
reader.readAsDataURL(file);
});
}
functionphotoMobileTerminal(){
letfileDom=document.getElementById(_options.fileID);
fileDom.click();
}
functionisMobileTerminal(){
if(/AppleWebKit.*Mobile/i.test(navigator.userAgent)||/Mobile/.test(navigator.userAgent)||/MIDP|SymbianOS|NOKIA|SAMSUNG|LG|NEC|TCL|Alcatel|BIRD|DBTEL|Dopod|PHILIPS|HAIER|LENOVO|MOT-|Nokia|SonyEricsson|SIE-|Amoi|ZTE/.test(navigator.userAgent))
return/Android|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent);
returnfalse;
}
})(window,document);
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