我們正在使用PhantomJS訪問我們公司的內部網站並截取屏幕截圖。從PhantomJS網站上的Ajax請求獲取狀態代碼
劇本基本上是PhantomJS與增加的WAITTIME變量 (https://github.com/ariya/phantomjs/blob/master/examples/rasterize.js)
var page = require('webpage').create(),
system = require('system'),
address, output, size;
//waitTime is how long to to wait for kibana and the data to load in millis.
//Increase this if your queries appear incomplete in your PDFs. 10s seems to work for me.
var waitTime = 10 * 1000;
if (system.args.length < 3 || system.args.length > 5) {
console.log('Usage: rasterize.js URL filename [paperwidth*paperheight|paperformat] [zoom]');
console.log(' paper (pdf output) examples: "5in*7.5in", "10cm*20cm", "A4", "Letter"');
console.log(' image (png/jpg output) examples: "1920px" entire page, window width 1920px');
console.log(' "800px*600px" window, clipped to 800x600');
phantom.exit(1);
} else {
address = system.args[1];
output = system.args[2];
// Uncomment the following line to login. Replace user:pass with your username and password.
//page.customHeaders={'Authorization': 'Basic '+btoa('user:pass')};
page.viewportSize = { width: 1280, height: 720 };
if (system.args.length > 3 && system.args[2].substr(-4) === ".pdf") {
size = system.args[3].split('*');
page.paperSize = size.length === 2 ? { width: size[0], height: size[1], margin: '0px' }
: { format: system.args[3], orientation: 'portrait', margin: '1cm' };
} else if (system.args.length > 3 && system.args[3].substr(-2) === "px") {
size = system.args[3].split('*');
if (size.length === 2) {
pageWidth = parseInt(size[0], 10);
pageHeight = parseInt(size[1], 10);
page.viewportSize = { width: pageWidth, height: pageHeight };
page.clipRect = { top: 0, left: 0, width: pageWidth, height: pageHeight };
} else {
console.log("size:", system.args[3]);
pageWidth = parseInt(system.args[3], 10);
pageHeight = parseInt(pageWidth * 3/4, 10); // it's as good an assumption as any
console.log ("pageHeight:",pageHeight);
page.viewportSize = { width: pageWidth, height: pageHeight };
}
}
if (system.args.length > 4) {
page.zoomFactor = system.args[4];
}
page.open(address, function (status) {
if (status !== 'success') {
console.log('Unable to load the address!');
phantom.exit();
} else {
window.setTimeout(function() {
page.render(output);
phantom.exit();
}, waitTime);
}
});
}
我們訪問正在運行JavaScript的網站,那是做給數據庫的請求,官方的例子之一。但是,根據給定的查詢,此請求可能會花費很長時間(最長10分鐘)。
因此,我們想要做的不是提供一個靜態的10分鐘等待時間,我們希望從在訪問的網站上運行的JavaScript中提取狀態代碼,如果它到達200,腳本應該採取「截圖」。
我們的問題是我們不知道如何從網站本身獲取信息。 (我們如何克服使用過的PhantomJS腳本和訪問網站之間的「橋樑」?)