Web 串行 api，无需用户手势即可打开端口

Question

In web serial api, I am able to open ports on button click. Is there any way to open port once the port is connected? onconnect event does not open port, asking for user gesture...I need automatic open for mass production...

Answer 1

As indicated in https://web.dev/serial/#open-port , requestPort() requires a user gesture such as touch or mouse click. However once you have a port, you can open() one on subsequent page load without any user gesture.

// Get all serial ports the user has previously granted the website access to.
const ports = await navigator.serial.getPorts();

// Assuming the first one is the one you want to open...
const port = ports[0];

// Open serial port without user gesture.
await port.open({ baudRate: 9600 });