javascript - 无法启动环境光传感器(Chrome、MacOS)
问题描述
一直在尝试用 ALS 进行试验,但到目前为止还不能让它发挥作用。我使用了以下代码段:
navigator.permissions.query({ name: 'ambient-light-sensor' }).then(result => {
if (result.state === 'denied') {
console.log('Permission to use ambient light sensor is denied.');
return;
}
const als = new AmbientLightSensor({frequency: 10});
als.addEventListener('activate', () => console.log('Ready to measure EV.'));
als.addEventListener('error', event => console.log(`Error: ${event.error.name}`));
als.addEventListener('reading', () => {
// Defaut ISO value.
const ISO = 100;
// Incident-light calibration constant.
const C = 250;
let EV = Math.round(Math.log2((als.illuminance * ISO) / C));
console.log(`Exposure Value (EV) is: ${EV}`);
});
als.start();
});
我得到的错误是:Error: NotReadableError
。控制台中没有其他错误或警告。
Chrome 金丝雀 v97,MacOS 10.15.7