为什么这些警报没有出现？ [英] why are these alerts not appearing?
本文介绍了为什么这些警报没有出现？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我当前正在尝试将警报时间设置为在查看器授予网络摄像头许可后3秒钟出现。警报应该还带有音频，因为它们应该同时触发。
I am currently trying to time alerts to appear 3 seconds after the viewer grants permission of webcam. The alerts are supposed to also have audio with them, as they're supposed to be triggered at the same time.
该摄像头具有面部跟踪功能，因此有很多额外的代码。因此，我不懂javascript，因此，请提供视觉效果，而不仅仅是提供语句。
The webcam has a face tracking feature with it, so there is a lot of extra code. So I don't know javascript, so please visuals help a lot more than statements.
这是我目前正在使用的代码。
This is my current code I am working with.
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>eve_</title>
<link rel="stylesheet" href="assets/demo.css">
<link rel="icon" rel="preload" href="images/evecircle.png" />
<script src="../build/tracking-min.js"></script>
<script src="../build/data/face-min.js"></script>
<script src="../node_modules/dat.gui/build/dat.gui.min.js"></script>
<script src="assets/stats.min.js"></script>
<script src="https://code.responsivevoice.org/responsivevoice.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<style>
video, canvas {
position: absolute;
}
</style>
</head>
<body onload="delayedAlert();">
<div class="demo-title">
<p><a href="http://trackingjs.com" target="_parent"></a></p>
</div>
<div class="demo-frame">
<div class="demo-container">
<video id="video" width="700" height="700" preload autoplay loop muted></video>
<canvas id="canvas" width="700" height="700"></canvas>
</div>
</div>
<audio>
<source src="audio/hello.wav" type="audio/wav" preload=true>
</audio>
<audio>
<source src="audio/is_something_here.wav" type="audio/wav" preload=true>
</audio>
<audio>
<source src="audio/oh_something_is_here.wav" type="audio/wav" preload=true>
</audio>
<audio>
<source src="audio/what_is_your_name.wav" type="audio/wav" preload=true>
</audio>
<script>
var timeoutID;
function delayedAlert() {
timeoutID = window.setTimeout(slowAlert, 5000);
}
window.onload = function() {
var video = document.getElementById('video');
var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
var inverse = function inverse(imageData) {
var data = imageData.data;
for (var i = 0; i < data.length; i += 4) {
data[i] = 255 - data[i];
data[i + 1] = 255 - data[i + 1];
data[i + 2] = 255 - data[i + 2];
}
var audio= document.getElementsByTagName('audio')[0];
const audio2 = document.getElementsByTagName('audio')[1];
var audio3 = document.getElementsByTagName('audio')[2];
var audio4 = document.getElementsByTagName('audio')[3];
return imageData;
};
var tracker = new tracking.ObjectTracker('face');
tracker.setInitialScale(4);
tracker.setStepSize(2);
tracker.setEdgesDensity(0.1);
tracking.track('#video', tracker, { camera: true });
tracker.on('track', function(event) {
context.clearRect(0, 0, canvas.width, canvas.height);
event.data.forEach(function(rect) {
context.strokeStyle = '#0000ff';
context.strokeRect(rect.x, rect.y, rect.width, rect.height);
context.font = '13px Helvetica';
context.fillStyle = "#fff";
context.fillText('x: ' + rect.x + '3px', rect.x + rect.width + 5, rect.y + 11);
context.fillText('y: ' + rect.y + '3px', rect.x + rect.width + 5, rect.y + 22);
});
});
var gui = new dat.GUI();
gui.add(tracker, 'edgesDensity', 0.5, 0.5).step(0.1);
gui.add(tracker, 'initialScale', 1.0, 10.0).step(0.1);
gui.add(tracker, 'stepSize', 1, 5).step(0.1);
};
function slowAlert() {
var audio= document.getElementsByTagName('audio')[0];
const audio2 = document.getElementsByTagName('audio')[1];
var audio3 = document.getElementsByTagName('audio')[2];
var audio4 = document.getElementsByTagName('audio')[3];
audio.play();
var myvar1;alert('Hello?');
audio2.play();
var myvar1;alert('Is something here?');
audio3.play();
var myvar2;alert('Something is here.');
};
</script>
<audio>
<source src="audio/hello.wav" type="audio/wav" preload=true>
</audio>
<audio>
<source src="audio/is_something_here.wav" type="audio/wav" preload=true>
</audio>
<audio>
<source src="audio/oh_something_is_here.wav" type="audio/wav" preload=true>
</audio>
<audio>
<source src="audio/what_is_your_name.wav" type="audio/wav" preload=true>
</audio>
</body>
</html>
推荐答案
似乎您忘记了呼叫 delayedAlert（）
这篇关于为什么这些警报没有出现？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
