An event handler that will be called when an error occurs. This is most often because an invalid request ID was passed into
webRequest.filterResponseData()
.
After this event is fired, the
webRequest.StreamFilter.error
property will contain a message giving more information about the error.
Note that this event is not triggered for network errors.
BCD tables only load in the browser
This example adds an
onerror
listener which logs the value of
webRequest.StreamFilter.error
.
function listener(details) {
// This example seems not useful because,
// a extension would use "details.requestId"
let filter = browser.webRequest.filterResponseData("12345");
filter.onerror = event => {
console.log(`Error: ${filter.error}`);
}
}
browser.webRequest.onBeforeRequest.addListener(
listener,
{urls: ["<all_urls>"], types: ["main_frame"]},
["blocking"]
);
This example uses no
"blocking"
.
function listener(details) {
let filter = browser.webRequest.filterResponseData(details.requestId);
filter.onerror = event => {
console.log(`Error: ${filter.error}`); // Error: Invalid request ID
}
}
browser.webRequest.onBeforeRequest.addListener(
listener,
{urls: ["<all_urls>"], types: ["main_frame"]}
);
最后修改： , 由 MDN 贡献者