Palances Liao
Thomas Steiner
现代方式
使用 window.getScreenDetails()
为了确保您的浏览器支持 getScreenDetails() 方法，请首先检查 window 对象中是否存在该方法。然后，调用 window.getScreenDetails() 以获取连接的屏幕。通过添加事件监听器以适应发生变化的屏幕详细信息，您可以根据应用的需要管理多个屏幕。
if ('getScreenDetails' in window) {
// The Window Management API is supported.
const screenDetails = await window.getScreenDetails();
screenDetails.addEventListener('screenschange', (event) => {
// Handle screens change.
});
}
经典方法
使用 window.screen 方法
控制跨屏布局没有经典的方法，但您可以使用 window.screen 属性回退到控制当前屏幕，并对新的 API 形状执行 polyfill。
if (!('getScreenDetails' in window)) {
// Returning a one-element array with the current screen,
// noting that there might be more.
window.getScreenDetails = async () => [window.screen];
// Set to `false`, noting that this might be a lie.
window.screen.isExtended = false;
}
渐进增强
以下演示显示了如何使用 Window Management API 处理多个屏幕。代码会先检查浏览器功能，然后回退到传统方式。
const detectButton = document.querySelector('#detectScreen');
const createButton = document.querySelector('#create');
const permissionLabel = document.querySelector('#permissionStatus');
const screensAvailLabel = document.querySelector('#screensAvail');
const popupUrl = './popup.html';
let screenDetails = undefined;
let permission = undefined;
let currentScreenLength = undefined;
detectButton.addEventListener('click', async () => {
if ('getScreenDetails' in window) {
screenDetails = await window.getScreenDetails();
screenDetails.addEventListener('screenschange', (event) => {
if (screenDetails.screens.length !== currentScreenLength) {
currentScreenLength = screenDetails.screens.length;
updateScreenInfo();
}
});
try {
permission =
(await navigator.permissions.query({ name: 'window-management' })).state === 'granted'
? 'Granted'
: 'No Permission';
} catch (err) {
console.error(err);
}
currentScreenLength = screenDetails.screens.length;
updateScreenInfo();
} else {
screenDetails = window.screen;
permission = 'Window Management API - NOT SUPPORTED';
currentScreenLength = 1;
updateScreenInfo();
}
});
createButton.addEventListener('click', () => {
let screen = screenDetails.screens[Math.floor(Math.random() * currentScreenLength)];
options = {
x: screen.availLeft,
y: screen.availTop,
width: screen.availWidth,
height: screen.availHeight,
};
window.open(popupUrl, '_blank', getFeaturesFromOptions(options));
});
function getFeaturesFromOptions(options) {
return (
'left=' +
options.x +
',top=' +
options.y +
',width=' +
options.width +
',height=' +
options.height
);
}
updateScreenInfo = () => {
screensAvailLabel.innerHTML = currentScreenLength;
permissionLabel.innerHTML = permission;
if ('getScreenDetails' in window && screenDetails.screens.length >= 1) {
createButton.disabled = false;
} else {
createButton.disabled = true;
}
};
深入阅读
演示
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link
rel="icon"
href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>🎉</text></svg>"
/>
<title>How to use multiple screens</title>
<link rel="stylesheet" href="/style.css" />
<!-- TODO: Devsite - Removed inline handlers -->
<!-- <script src="/script.js" type="module"></script> -->
</head>
<body>
<h1>How to use multiple screens</h1>
<div>
<div>
Permission Status:
<span id="permissionStatus"></span>
</div>
<div>Screens Available: <span id="screensAvail"></span></div>
</div>
<button id="detectScreen">Detect Screens</button>
<button id="create" disabled>Create Page On Random Screen</button>
</body>
</html>CSS
:root {
color-scheme: dark light;
}
html {
box-sizing: border-box;
}
*,
*:before,
*:after {
box-sizing: inherit;
}
body {
margin: 1rem;
font-family: system-ui, sans-serif;
}
JS
const detectButton = document.querySelector('#detectScreen');
const createButton = document.querySelector('#create');
const permissionLabel = document.querySelector('#permissionStatus');
const screensAvailLabel = document.querySelector('#screensAvail');
const popupUrl = 'supporting-popup.html';
let screenDetails = undefined;
let permission = undefined;
let currentScreenLength = undefined;
detectButton.addEventListener('click', async () => {
if ('getScreenDetails' in window) {
screenDetails = await window.getScreenDetails();
screenDetails.addEventListener('screenschange', (event) => {
if (screenDetails.screens.length !== currentScreenLength) {
currentScreenLength = screenDetails.screens.length;
updateScreenInfo();
}
});
try {
permission =
(await navigator.permissions.query({ name: 'window-placement' }))
.state === 'granted'
? 'Granted'
: 'No Permission';
} catch (err) {
console.error(err);
}
currentScreenLength = screenDetails.screens.length;
updateScreenInfo();
} else {
screenDetails = window.screen;
permission = 'Multi-Screen Window Placement API - NOT SUPPORTED';
currentScreenLength = 1;
updateScreenInfo();
}
});
createButton.addEventListener('click', () => {
const screen =
screenDetails.screens[Math.floor(Math.random() * currentScreenLength)];
const options = {
x: screen.availLeft,
y: screen.availTop,
width: screen.availWidth,
height: screen.availHeight,
};
window.open(popupUrl, '_blank', getFeaturesFromOptions(options));
});
const getFeaturesFromOptions = (options) => {
return (
'left=' +
options.x +
',top=' +
options.y +
',width=' +
options.width +
',height=' +
options.height
);
};
const updateScreenInfo = () => {
screensAvailLabel.innerHTML = currentScreenLength;
permissionLabel.innerHTML = permission;
if ('getScreenDetails' in window && screenDetails.screens.length > 1) {
createButton.disabled = false;
} else {
createButton.disabled = true;
}
};