// 创建一个网页实例
var page = require('webpage').create();

// 加载页面
page.open('https://www.baidu.com/', function () {
    // 给网页截屏保存
    page.render('baidu.png');
    phantom.exit();
})

const puppeteer = require("puppeteer");

(async () => {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  // 设置视窗大小
  await page.setViewport({
    width: 1400,
    height: 800,
  });
  // 打开页面
  await page.goto("https://zhuanlan.zhihu.com/p/76237595"); 
  // path: 截屏文件保存路径
  await page.screenshot({ path: "example.png" ,fullPage: true }) 

  await browser.close();
})();

var page = require('webpage').create();

page.open("https://mp.weixin.qq.com/s/YHeEjam6lze8OgyiPBWorQ", function (status) {
    page.viewportSize = { width:1024, height:768 };
    page.render('screenshot.png');
    slimer.exit()
});