Node.js爬蟲獲取天氣與每日問候

安裝依賴

安裝node.js,同時安裝好依賴：

npm install request --save // http請求庫
npm install cheerio --save // 分析html工具
npm install express --save // nodejs web框架
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獲取墨跡天氣

地址示例：
東莞 tianqi.moji.com/weather/chi…
廣州 tianqi.moji.com/weather/chi…
深圳 tianqi.moji.com/weather/chi…

可打開墨跡天氣網站找到女友對應城市修改url地址拼音便可。

查看網頁結構：

下面開始提取網頁天氣信息：

const request = require("request")
const cheerio = require("cheerio")
const weatherURL = 'https://tianqi.moji.com/weather/china/Guangdong/dongguan'

// 獲取墨跡天氣提示信息
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}天氣\n${desc}\n溫度：${temp}\n溼度：${water}\n風力：${win}\n${tips}`
    		resolve(words)
    	} else {
    		reject(error)
    	}      
      })
   })   
}

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獲取每日一句

地址：wufazhuce.com/

const greetingURL = 'http://wufazhuce.com/'
// 獲取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] || '網絡錯誤，獲取每日問候失敗！'
    			resolve(result)    
    		} else {
    			reject(error)				
    		}
    	})
    })
}

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計算在一塊兒天數

// 計算在一塊兒的日子
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 `寶貝，這是咱們在一塊兒的${diffDate}天`
}
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接口調用

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 () { // 啓動ip和端口
    var port = server.address().port
    console.log("應用實例，訪問地址爲 http://%s:%s", port)
})
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