An event handler that will be called when the stream is opened and is about to begin delivering data. From this point on, the extension may use filter functions like
write()
,
disconnect()
，或
close()
.
BCD tables only load in the browser
This example will replace the page content with "replacement text":
function listener(details) {
let filter = browser.webRequest.filterResponseData(details.requestId);
filter.onstart = event => {
console.log("started");
let encoder = new TextEncoder();
filter.write(encoder.encode("replacement content"));
filter.close();
}
}
browser.webRequest.onBeforeRequest.addListener(
listener,
{urls: ["https://example.org/"], types: ["main_frame"]},
["blocking"]
);
最后修改： , 由 MDN 贡献者