Get screenshot for every page generated by pdf2html using phantomjs

capture.js

"use strict";
var page = require('webpage').create();
var system = require('system');
if (system.args.length !== 2) {
	system.stderr.writeLine('Put target URL as argument');
} else {
	var url = system.args[1];
}
page.viewportSize = { width: 1080, height: 1920 };
page.open(url, function (status) {
    if (status !== 'success') {
        console.log('Unable to access network');
    } else {
		var rects = page.evaluate(function () {
			var elements = document.querySelectorAll('div[data-page-no]');
			if (!elements) return null;
			return Array.prototype.slice.call(elements).map(function (element) {
				var rect = element.getBoundingClientRect();
				return {top: parseInt(rect.top), left: parseInt(rect.left), width: parseInt(rect.width), height: parseInt(rect.height)};
			});
		});
		setTimeout(function(){
			rects.forEach(function(rect, index){
				setTimeout(function(){
					console.log(index, JSON.stringify(rect));
					page.evaluate(function(top){
						document.getElementById("page-container").scrollTop = top;
					}, rect.top);
				}, index * 1000);
				setTimeout(function(){
					page.clipRect = {top: 0, left: rect.left, width: rect.width, height: rect.height};
					page.render((index + 1) + '.png', {format: 'png', quality: '80'});
					if(index === rects.length - 1) phantom.exit();
				}, index * 1000 + 500);
			});
		}, 1000);
    }
});

Known bug: scroll mistake when capture the last page