PhantomJS非常有助于截取网页截图并将网页转换为PDF.我们在这里给出了一个简单的例子来演示它是如何工作的.
示例
var page = require('webpage').create();page.open('http://phantom.org/',function(status){ page.render('phantom.png'); phantom.exit();});
执行上述程序,输出将保存为 phantom.png .
将网页转换为PDF
PhantomJS还有助于转换将网页添加到带有页眉和页脚的PDF页面中.看一下下面的例子,了解它是如何工作的.
var wpage = require('webpage').create(); var url = "https://en.wikipedia.org/wiki/Main_Page"; var output = "test.pdf"; wpage.paperSize = { width: screen.width+'px', height: '1500px', margin: { 'top':'50px', 'left':'50px', 'rigtht':'50px' }, orientation:'portrait', header: { height: "1cm", contents: phantom.callback(function(pageNumber, nPages) { return "Header " + pageNumber + " / " + nPages + "
"; }) }, footer: { height: "1cm", contents: phantom.callback(function(pageNumber, nPages) { return "Footer " + pageNumber + " / " + nPages + "
"; }) } } wpage.open(url, function (status) { if (status !== 'success') { console.log('Page is not opening'); phantom.exit(); } else { wpage.render(output); phantom.exit(); } });
上述程序生成以下输出.
The above will convert the page into pdf and will be saved in test.pdf
将画布转换为图像
Phantomjs可以轻松地将Canvas转换为图像.看看下面的例子,了解它是如何工作的.
var page = require('webpage').create(); page.content = ''; page.evaluate(function() { var context,e1; el = document.getElementById('surface'); context = el.getContext('2d'); context.font = "30px Comic Sans MS"; context.fillStyle = "red"; context.textAlign = "center"; context.fillText("Welcome to PhantomJS ", 200, 200); document.body.style.backgroundColor = 'white'; document.body.style.margin = '0px'; }); page.render('canvas.png'); phantom.exit();
上述程序生成以下输出.