JS脚本实现定时到网站上签到/签退功能

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之前介绍过使用temperMonkey屏蔽CSDN广告的方法，主要就是要针对性地分析网站结构，然后用代码去改变或者操作DOM。今天也一样，我们需要观察网页结构，找到我们要操作的按钮，触发他的click事件就可以了。下面以公司打卡签到的网站为例，做一些坏坏的事情。本文读者最好有一定的HTML和JavaScript基础。

首先，想象一下你去签到需要做什么：

打开网站
登陆
点击“签到”按钮

然后每一步我们都可以让代码帮我们去做。

0. 如何定时

这段代码是核心，就是根据当前时间和设定的时间做差值，来确定定时器的值
看懂这段代码，后面的就都容易了。都是在利用定时器触发callback。

// user setting
const SIGN_IN_TIME = "09:30:00"; // 签到时间
const SIGN_OUT_TIME = "20:00:00"; // 签退时间

// code implementation
logTime("code start running");
const now = new Date();
const today = now.getFullYear() + "-" + (now.getMonth() + 1) + "-" + now.getDate();
var signInTime = +new Date(`${today} ${SIGN_IN_TIME}`);
logTime("signInTime", new Date(signInTime));
var signOutTime = +new Date(`${today} ${SIGN_OUT_TIME}`);
logTime("signOutTime", new Date(signOutTime));
// diff in or out
if (now > signInTime && now < signOutTime) {
 // ready to sign out for today
 console.log("Seconds to sign out for today: " + (signOutTime - now) / 1000);
 setTimeout(callback, signOutTime - now);
} else {
 // ready to sign in for tomorrow
 signInTime = +signInTime + 60 * 60 * 24 * 1000;
 console.log("Seconds to sign in for tomorrow: " + (signInTime - now) / 1000);
 setTimeout(callback, signInTime - now);
}

function logTime(str, time = new Date()) {
 console.log(`${str} -> ${time.getHours()}:${time.getMinutes()}:${time.getSeconds()}`);
}

1. 定时自动打开网站

因为大多数网站都有，“长时间未操作-自动退出”的设置。所以我们要在需要打卡的时候再打开网站。
在电脑本地跑一个程序，使用定时器。这里跑一个node程序：

const open = require('open');
logTime("Start Runing");

// user setting
const SIGN_IN_TIME = "09:30:00";
const SIGN_OUT_TIME = "20:20:00";

// code implementation
const openBrowser = async () => {
 await open('http://172.10.80.42');
};
logTime("code start running");
const now = new Date();
const today = now.getFullYear() + "-" + (now.getMonth() + 1) + "-" + now.getDate();
var signInTime = +new Date(`${today} ${SIGN_IN_TIME}`);
logTime("signInTime", new Date(signInTime));
var signOutTime = +new Date(`${today} ${SIGN_OUT_TIME}`);
logTime("signOutTime", new Date(signOutTime));
// diff in or out
if (now > signInTime && now < signOutTime) {
 // ready to sign out for today
 console.log("Seconds to sign out for today: " + (signOutTime - now) / 1000);
 setTimeout(openBrowser, signOutTime - now);
} else {
 // ready to sign in for tomorrow
 signInTime = +signInTime + 60 * 60 * 24 * 1000;
 console.log("Seconds to sign in for tomorrow: " + (signInTime - now) / 1000);
 setTimeout(openBrowser, signInTime - now);
}

function logTime(str, time = new Date()) {
 console.log(`${str} -> ${time.getHours()}:${time.getMinutes()}:${time.getSeconds()}`);
}

2. 自动登录

这个重点还是在于找到需要填入内容的DOM元素

(function() {
 'use strict';
 // login
 document.querySelector("#loginid").value = "用户名";
 document.querySelector("#userpassword").value = "密码";
 document.querySelector("#login").click();
})();

3. 定时点击按钮

这一步最重要的是要准确找到按钮，检查元素慢慢查找吧。
其次，设定好签到和签退的时间，只有固定时间才会自动签到，防止每次登陆进来自动签到或签退，这样太频繁被发现。

(function() {
 'use strict';

 // user setting
 const SIGN_IN_TIME = "09:00:00";
 const SIGN_OUT_TIME = "21:00:00";

 // code implementation
 logTime("code start running");
 const now = new Date();
 const today = now.getFullYear()+"-"+(now.getMonth()+1)+"-"+now.getDate();
 var signInTime = +new Date(`${today} ${SIGN_IN_TIME}`);
 logTime("signInTime", new Date(signInTime));
 var signOutTime = +new Date(`${today} ${SIGN_OUT_TIME}`);
 logTime("signOutTime", new Date(signOutTime));
 // diff in or out
 if(now > signInTime && now < signOutTime) {
 // ready to sign out for today
 console.log("Seconds to sign out for today: " + (signOutTime - now)/1000);
 setTimeout(signInorSignOut, signOutTime - now);
 } else {
 // ready to sign in for tomorrow
 signInTime = +signInTime + 60 * 60 * 24 * 1000;
 console.log("Seconds to sign in for tomorrow: " + (signInTime - now)/1000);
 setTimeout(signInorSignOut, signInTime - now);
 }

 // signInorSignOut
 function signInorSignOut(){
 logTime(`signInButton clicked!`);
 // 重点就在这儿了，找到网站的签到按钮#signInButton，并触发他的点击事件
 document.querySelector("#signInButton").click();
 }

 function logTime(str, time=new Date()){
 console.log(`${str} -> ${time.getHours()}:${time.getMinutes()}:${time.getSeconds()}`);
 }
})();

4. 结束

一套操作，打完收工。每天下班的时候，不管是提前溜还是晚点到。记得本地开一下程序：