一直等待并执行回调函数
This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/464516/1179152/WaitFor.js
// ==UserScript==
// @name WaitFor
// @namespace http://bbs.91wc.net/?wait-for
// @version 0.1
// @description 一直等待并执行回调函数
// @author Wilson
// ==/UserScript==
function WaitFor(cond, callback, delay) {
delay = delay || 100;
var timer = setTimeout(function(){
if(timer) clearTimeout(timer);
if(cond && cond()) callback();
WaitFor(cond, callback, delay);
}, delay);
}
//使用：
//WaitFor(()=>{return true}, ()=>{console.log(1)});
//cond 条件回调函数，当cond()为真则执行callback
//callback 回调函数
//delay 多久检查一次条件，单位ms，默认100