// ==UserScript==
// @run-at       document-start
// ==/UserScript==

(function(){
    let oldadd=EventTarget.prototype.addEventListener
    EventTarget.prototype.addEventListener=function (...args){
        console.log('addEventListener',...args)

        // 劫持指定的监听类型
        if(args.length !== 0 && args[0] === 'visibilitychange'){
            console.log('劫持visibilitychange成功')
            return;
        }

        oldadd.call(this,...args)
    }
})()