为啥？我电脑启动QtScrcpy.exe这个程序，电脑桌面显示手机画面不到3秒钟，就消失没了？
Posted
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了为啥？我电脑启动QtScrcpy.exe这个程序，电脑桌面显示手机画面不到3秒钟，就消失没了？相关的知识，希望对你有一定的参考价值。
QtScrcpy.exe是安卓数据线投屏软件，因为是一个免费软件有点问题，兼容性不好也是正常。
打开QtScrcpy.exe，同时手机在开发者模式中打开USB调试：
用数据线连接电脑
软件界面adb的“执行”
设备序列号自动获取成功
启动服务
，为啥这个 JavaScript 程序（DIGITAL TIMER）不工作，当我点击它来启动计时器时？
【中文标题】，为啥这个 JavaScript 程序（DIGITAL TIMER）不工作，当我点击它来启动计时器时？【英文标题】：Do anybody know, why this JavaScript program (DIGITAL TIMER) is not working, when I click it to start the timer?有谁知道，为什么这个 JavaScript 程序（DIGITAL TIMER）不工作，当我点击它来启动计时器时？ 【发布时间】：2021-12-12 02:15:46 【问题描述】：有人知道，为什么当我点击这个 JavaScript 程序 (DIGITAL TIMER) 来启动计时器时它不起作用？
这是 HTML 代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="style.css">
<title>Document</title>
</head>
<body>
<div class="timer-container">
<h1 id="timer-display">00:00:00</h1>
</div>
<script src="script.js"></script>
</body>
</html>
这是 CSS 代码：
body
font-family: "Software Tester 7";
background-color: black;
.timer-container
background-color: yellow-green;
border: 5px solid gray;
border-radius: 2px;
margin-top: 19%;
h1
color: white;
text-align: center;
font-size: 120px;
margin: 0;
这是 JavaScript 代码：
var timeBegan = null; // did the clock start?
var timeStopped = null; // at what time was the timer stopped?
var stoppedDuration = 0; // how long was the timer stopped?
var startInterval = null; // this is needed to stop the startInterval() method
var flag = false; // to control the start/stop of the timer
const timerContainer = document.getElementsByClassName("timer-container")[0];
timerContainer.addEventListener("click", function()
if(!flag)
startTimer();
flag = true;
else
stopTimer();
flag = false;
)
function startTimer()
if(timeBegan === null)
timeBegan = new Date();
if(timeStopped !== null)
stoppedDuration += (new Date() - timeStopped);
startInterval = setInterval(clockRunning, 10);
function stopTimer()
timeStopped = new Date();
clearInterval(startInterval);
function clockRunning()
var currentTime = new Date
var timeElapsed = new Date(currentTime - timeBegan - stoppedDuration);
var minutes = timeElapsed.getUTCMinutes();
var seconds = timeElapsed.getUTCSeconds();
var milliseconds = timeElapsed.getUTCMilliseconds();
milliseconds = Math.floor(milliseconds/10);
document.getElementById("timer.display").innerHTML =
(minutes = minutes < 10 ? '0' + minutes:minutes) + ":" +
(seconds = seconds < 10 ? '0' + seconds:seconds) + ":" +
(milliseconds = milliseconds < 10 ? '0' + milliseconds:milliseconds);
我希望有人能真正帮助我解决我的问题。
来自这个 YouTube 教程：“https://www.youtube.com/watch?v=_bvutuhUxHY&ab_channel=codefoxx”。
非常感谢您的及时答复:)
【问题讨论】：
将const timerContainer 移动到函数体中。
您检查您的开发者控制台是否有错误？
【参考方案1】：
这是一个很小的错误
您的时钟 ID 是 timer-display，但在 clockRunning 函数中，您已将其用作 timer.display
其他一切都很好 点击定时器开始运行，再次点击停止定时器，
注意：如果你想默认启动计时器，那么在 body onload 上调用 startTimer 函数
var timeBegan = null; // did the clock start?
var timeStopped = null; // at what time was the timer stopped?
var stoppedDuration = 0; // how long was the timer stopped?
var startInterval = null; // this is needed to stop the startInterval() method
var flag = false; // to control the start/stop of the timer
const timerContainer = document.getElementsByClassName("timer-container")[0];
timerContainer.addEventListener("click", function()
if(!flag)
startTimer();
flag = true;
else
stopTimer();
flag = false;
)
function startTimer()
if(timeBegan === null)
timeBegan = new Date();
if(timeStopped !== null)
stoppedDuration += (new Date() - timeStopped);
startInterval = setInterval(clockRunning, 10);
function stopTimer()
timeStopped = new Date();
clearInterval(startInterval);
function clockRunning()
var currentTime = new Date
var timeElapsed = new Date(currentTime - timeBegan - stoppedDuration);
var minutes = timeElapsed.getUTCMinutes();
var seconds = timeElapsed.getUTCSeconds();
var milliseconds = timeElapsed.getUTCMilliseconds();
milliseconds = Math.floor(milliseconds/10);
document.getElementById("timer-display").innerHTML =
(minutes = minutes < 10 ? '0' + minutes:minutes) + ":" +
(seconds = seconds < 10 ? '0' + seconds:seconds) + ":" +
(milliseconds = milliseconds < 10 ? '0' + milliseconds:milliseconds);
body
font-family: "Software Tester 7";
background-color: black;
.timer-container
background-color: yellow-green;
border: 5px solid gray;
border-radius: 2px;
margin-top: 19%;
h1
color: white;
text-align: center;
font-size: 120px;
margin: 0;
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="style.css">
<title>Document</title>
</head>
<body>
<div class="timer-container">
<h1 id="timer-display">00:00:00</h1>
</div>
</body>
</html>【讨论】：
以上是关于为啥？我电脑启动QtScrcpy.exe这个程序，电脑桌面显示手机画面不到3秒钟，就消失没了？的主要内容，如果未能解决你的问题，请参考以下文章
为啥我的电脑的第一启动项是Removable Devices