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：
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：
node timer.js