Nodejs爬蟲實戰（五）

1. 抓取標籤內容

1. 引入模塊

   新模塊jsdom中的JSDOM

2. 創建對象

    let DOM = new JSDOM(html);
    let document = DOM.window.document;
   

3. dom操作

    document.querySelector('.tm-count').innerHTML
   

   完整代碼

    var index = 0;
    const fs = require('fs');
    const url = require('url');
    const gbk = require('gbk');
    const JSDOM = require('jsdom').JSDOM;
    
    GetUrl('https://detail.tmall.com/item.htm?id=548466958386&ali_refid=a3_430583_1006:1103419234:N:%E5%8D%8E%E4%B8%BA:bb84ee4c8f67c7b202d725187b7ad429&ali_trackid=1_bb84ee4c8f67c7b202d725187b7ad429&spm=a230r.1.14.1&sku_properties=5919063:6536025;12304035:116177',(data)=>{
    
    	var html = gbk.toString('utf-8',data);
    
    	let DOM = new JSDOM(html);
    	let document = DOM.window.document;
    
    	console.log(document.querySelector('.tm-count').innerHTML)
    })
    function GetUrl(sUrl,success){
    	index++;
    	var urlObj = url.parse(sUrl);
    	var http ='';
    	if(urlObj.protocol == 'http:'){
    		http = require('http');
    	}
    	else{
    		http = require('https');
    	}
    
    	let req = http.request({
    		'hostname':urlObj.hostname,
    		'path':urlObj.path
    	},res=>{
    		if(res.statusCode == 200){
    			var arr = [];
    			var str = '';
    			res.on('data',buffer=>{
    				arr.push(buffer);
    				//str +=buffer;
    			});
    			res.on('end',()=>{
    				let b = Buffer.concat(arr);
    
    				success && success(b);
    
    			})
    		}
    		else if(res.statusCode == 302 || res.statusCode == 301){
    			console.log(`第${index}次重定向`,res.headers.location);
    			GetUrl(res.headers.location,success)
    		}
    	});
    
    	req.end();
    	req.on('error',()=>{
    		console.log('404');
    	})
    }