A Tampermonkey JavaScript to alert you go to study after watching some websites more than a specific period.

Go to study right now!

// ==UserScript==
// @name         Study now!
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       Shaoqun Liu
// @match        *://*.iqiyi.com/*
// @match        *://*.youku.com/*
// @match        *://*.le.com/*
// @match        *://*.letv.com/*
// @match        *://v.qq.com/*
// @match        *://*.tudou.com/*
// @match        *://*.mgtv.com/*
// @match        *://film.sohu.com/*
// @match        *://tv.sohu.com/*
// @match        *://*.acfun.cn/v/*
// @match        *://*.bilibili.com/*
// @match        *://vip.1905.com/play/*
// @match        *://*.pptv.com/*
// @match        *://v.yinyuetai.com/video/*
// @match        *://v.yinyuetai.com/playlist/*
// @match        *://*.fun.tv/vplay/*
// @match        *://*.wasu.cn/Play/show/*
// @match        *://*.56.com/*
// @match        *://*.youtube.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    var minute = 15;
    var count = 0;
    setInterval(function(){
        alert("你已经连续看了超过"+(++count)*15+"分钟了哦");
    }, minute*60*1000);
    // Your code here...
})();