Node.js爬虫如何获取天气和每日问候详解

npm install request --save // http请求库npm install cheerio --save // 分析html工具npm install express --save // nodejs web框架

const request = require("request")const cheerio = require("cheerio")const weatherURL = 'https://tianqi.moji.com/weather/china/Guangdong/dongguan'// 获取墨迹天气提示信息function getWeatherTips(url) { return new Promise((resolve,reject)=>{ 	request(weatherURL,(error,res,body)=>{ 	 if (!error) { 	 let html = res.body || ""; 		let $ =cheerio.load(html) 		let temp = $('.wea_weather em').text().trim()+'℃' 		let desc = $('.wea_weather b').text().trim() 		let water = $('.wea_about span').text().trim() 		let win = $('.wea_about em').text().trim() 		let tips = $('.wea_tips em').text().trim() 		let words=`今日${city}天气/n${desc}/n温度：${temp}/n湿度：${water}/n风力：${win}/n${tips}` 		resolve(words) 	} else { 		reject(error) 	}  }) }) }

const greetingURL = 'http://wufazhuce.com/'// 获取wufazhuce.com每日一句function getDailyGreeting() { return new Promise((resolve,reject)=>{ 	request(greetingURL,(error,res,body)=>{ 		let everyDayWordsList = []; 		if(!error && res.statusCode==200) { 			let $ = cheerio.load(res.body.toString()) 				$('div .fp-one-cita a').each(function(item){ 					if($(this).text()){ 						everyDayWordsList.push($(this).text().trim()) 					}   				}) 			let result = everyDayWordsList[0] || '网络错误，获取每日问候失败！' 			resolve(result)  		} else { 			reject(error)				 		} 	}) })}

// 计算在一起的日子function getDiffDate(targetDate) { let date1 = new Date(targetDate); let date2 = new Date(); date1 = new Date(date1.getFullYear(), date1.getMonth(), date1.getDate()); date2 = new Date(date2.getFullYear(), date2.getMonth(), date2.getDate()); const diff = date2.getTime() - date1.getTime(); const diffDate = diff / (24 * 60 * 60 * 1000); return `宝贝，这是我们在一起的${diffDate}天`}

var express=require('express');var app=express();const api = require('./crawer.js')app.get('/words',async function(req,res){ let dateTips = api.getDiffDate() let weather = await api.getWeatherTips() let words = await api.getDailyGreeting() let str =`${dateTips}/n${weather}/n${words}` res.writeHead(200, {'Content-Type': 'application/json; charset=utf-8'}) res.end(str)})var server = app.listen(8083, function () { // 启动ip和端口 var port = server.address().port console.log("应用实例，访问地址为 http://%s:%s", port)})