EyeDropper
EyeDropper：拾色器，从屏幕上选择颜色
需要用户交互操作
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>EyeDropper</title>
</head>
<body>
<strong>EyeDropper</strong>
<hr />
<button type="button" id="btn-open">打开 EyeDropper, 选择颜色</button>
<div>
<span>当前选择的颜色：</span>
<input type="color" id="color-input" value="#ffffff" />
<b id="result"></b>
</div>
<script>
// EyeDropper: 从屏幕上选择颜色
// 该 API 不允许在没有用户意图的情况下启动拾色器模式。只能在用户操作（例如按钮点击）的响应中调用 EyeDropper.prototype.open() 方法
const openBtn = document.getElementById('btn-open');
const result = document.getElementById('result');
const colorInput = document.getElementById('color-input');
let eyeDropper = null;
openBtn.addEventListener('click', async () => {
if (!eyeDropper) {
eyeDropper = new EyeDropper();
}
try {
// 打开 EyeDropper 选择颜色
const { sRGBHex } = await eyeDropper?.open();
console.log('color => ', sRGBHex);
result.textContent = sRGBHex;
colorInput.value = sRGBHex;
} catch (error) {
const { message } = new Error(error);
if (message.includes('canceled')) {
// 用户取消选择颜色
console.log('已取消选择颜色');
} else {
console.log('error => ', message);
}
}
});
</script>
</body>
</html>