using phantom package.

phantom.js

var phantom = require('phantom');
var phInstance = null;

phantom.create(['--ignore-ssl-errors=yes', '--load-images=no']).then(instance => {
  phInstance = instance;
  return instance.createPage();
}).then(page => {
  // use page

  page.on('onResourceRequested', function (requestData){
    console.info('Requesting', requestData.url)
  });

  page.open('http://127.0.0.1:8080/?vid=500086').then((status)=>{

    if(status !== 'success'){
      console.log('Unable to access network');
    }else{
      checkReadyState(phInstance, page);
    }
  });


})
.catch(error => {
  console.log(error);
  phInstance.exit();
});


function onPageReady(phantom, page){
  page.render('aaa' + Date.now() + '.pdf');
  page.evaluate(function (){
    return document.documentElement.outerHTML;
  }).then((res)=>{
    // TODO 缓存
    console.log(res);
    phantom.exit();
  });


}


function checkReadyState(phantom, page){
  setTimeout(function (){
    page.evaluate(function (){
      return document.querySelector('.video_list ul').innerHTML;
    }).then((res)=>{
      if("" != res.trim()){
        onPageReady(phantom, page);
      }else{
        checkReadyState(phantom, page);
      }
    });
  }, 5);
}