class LoginBaiDu{
    constructor() {
        this.url = 'https://www.baidu.com/';
        this.init();
    }
async init(){
	console.log('正在启动浏览器...');
	this.browser = await puppeteer.launch({headless:false});
	console.log('正在打开新页面...');
	this.page = await this.browser.newPage();
	await this.openBaiDu(this.url);

	console.log('正在关闭浏览器...');
	await timeout(delay);
	await this.browser.close();
}

async openBaiDu(url){
	await timeout(delay);
	let page = this.page;
	await page.goto(url);
	try{
		await timeout(delay);
		var login = await page.$('#u1 .lb');
		console.log('正在获取登录节点---------------'+login);
		await login.click();
		await timeout(1000);

		var userNameLogin = await page.$('#TANGRAM__PSP_10__footerULoginBtn');
		await userNameLogin.click();
		await timeout(1000)

		await page.type('[name=userName]','来生只为你心动',{delay:200});
		await timeout(500);
        // 密码就没填 ^_^
		await page.type('[name=password]','***',{delay:200});
		await timeout(1000)

		// 点击登录
		console.log('点击登录百度...');
		var commit = await page.$('#TANGRAM__PSP_10__submit');
		await commit.click();

		await timeout(2000)
	} catch(e){
		console.log("执行出错......."+e);
		await page.screenshot({path:'./err.png',type: 'png'});
	}
}

//到网易体育的首页，抓取网易推荐的新闻的a链接列表
var listMap = await page.evaluate(() => {
    var alist = [...document.querySelectorAll('.topnews_news ul li a')];
    return alist.map((el) => {
        return {
            href: el.href,
            title: el.innerText
        }
    });
});
// 遍历这些a链接，去文章详情页 把文章的标题，来源和内容抓取出来
for(var i=0;i<listMap.length;i++){
    var a = listMap[i].href;
    await this.loadContent(a);
}

async loadContent(url){
    try{
        await timeout(2000);
        let page = this.page;
        await page.goto(url);

        var title = await page.$eval('#epContentLeft h1',el => el.innerText);
        var source = await page.$eval('#ne_article_source',el => el.innerText);

        var contentP = await page.evaluate(() => {
            var pList = [...document.querySelectorAll('#endText p')];
            return pList.map(el => {
                return {
                    p:el.innerHTML
                };
            });
        });
        console.log('----------load content start-----------------------');
        console.log(title);
        console.log(source);
        console.log(contentP);
        console.log('---------load content end--------------------------');

        // 将他们保存在本地文件中，其实一般 要做一个新闻类的产品的话，把文章解析出来直接存在自己的数据库就可以了
        // 然后app端取自己库里面的最新文章
        var cont = title+"\r\n"+source+"\r\n"+contentP;
        fs.writeFile("./"+title+".txt", cont,{flag:'a',encoding:'utf-8',mode:'0666'}, function(err) {
            if(err) {
                return console.log(err);
            }
        });

    } catch(e){
        console.log(e);
    }
}