setTimeout not always working in Greasemonkey

问题

I've found a lot of similar problems but none equal and no right solution. This is a very strange issue.

I have a simple Greasemonkey script to test the issue:

// ==UserScript==
// @name        testdiddio
// @namespace   http://userscripts.org/users/useridnumber
// @include     https://www.google.it/
// @version     1
// ==/UserScript==


function wait(){
    console.info("wait");
    setTimeout(wait,1000);
}

console.info("start");
wait();

This is the output from firebug:

start
wait
wait
wait
wait

The wait() function is called 4 times then stops. If I set the Timeout to 100ms the call seems works for at least 10/15 seconds then stops.

I'm using: Firefox 12.0 Greasemonkey 0.9.19

回答1:

This is a bug in Greasemonkey 0.9.19.
A feature was added to allow setTimeout() to work even when a page's JS was disabled and it introduced some complications (Issues 1549, 1552, and 1553, etc.).

It should be resolved shortly in release 0.9.20, or revert to version 0.9.18.

来源：https://stackoverflow.com/questions/10553274/settimeout-not-always-working-in-greasemonkey