以下PhantomJS代码可用于获取网页的页面标题<title>
var page = require('webpage').create();
page.open(url, function(status) {
var title = page.evaluate(function() {
return document.title;
});
console.log('Page title is ' + title);
phantom.exit();
});
以下PhantomJS代码会将多个网址呈现为png文件。
// Render Multiple URLs to file
var RenderUrlsToFile, arrayOfUrls, system;
system = require("system");
/*
Render given urls
@param array of URLs to render
@param callbackPerUrl Function called after finishing each URL, including the last URL
@param callbackFinal Function called after finishing everything
*/
RenderUrlsToFile = function(urls, callbackPerUrl, callbackFinal) {
var getFilename, next, page, retrieve, urlIndex, webpage;
urlIndex = 0;
webpage = require("webpage");
page = null;
getFilename = function() {
return "rendermulti-" + urlIndex + ".png";
};
next = function(status, url, file) {
page.close();
callbackPerUrl(status, url, file);
return retrieve();
};
retrieve = function() {
var url;
if (urls.length > 0) {
url = urls.shift();
urlIndex++;
page = webpage.create();
page.viewportSize = {
width: 800,
height: 600
};
page.settings.userAgent = "Phantom.js bot";
return page.open("http://" + url, function(status) {
var file;
file = getFilename();
if (status === "success") {
return window.setTimeout((function() {
page.render(file);
return next(status, url, file);
}), 200);
} else {
return next(status, url, file);
}
});
} else {
return callbackFinal();
}
};
return retrieve();
};
arrayOfUrls = null;
if (system.args.length > 1) {
arrayOfUrls = Array.prototype.slice.call(system.args, 1);
} else {
console.log("Usage: phantomjs render_multi_url.js [domain.name1, domain.name2, ...]");
arrayOfUrls = ["www.google.com", "www.bbc.co.uk", "www.phantomjs.org"];
}
RenderUrlsToFile(arrayOfUrls, (function(status, url, file) {
if (status !== "success") {
return console.log("Unable to render '" + url + "'");
} else {
return console.log("Rendered '" + url + "' at '" + file + "'");
}
}), function() {
return phantom.exit();
});
渲染文件的名称格式为“rendermulti-”+ urlIndex +“。png”。但我希望它是页面标题+“。png”。如何根据我的要求修改上述代码。
答案 0 :(得分:1)
由于page
是全局的,您可以通过以下方式轻松更改getFilename()
:
getFilename = function() {
var title = page.evaluate(function() {
return document.title;
});
return title + ".png";
};
您也无需访问页面上下文(page.evaluate()
内)以获取标题。您只需访问page.title
:
getFilename = function() {
return page.title + ".png";
};
可能是标题包含无法出现在目录或文件中的字符。如果它包含例如a/b
,则会尝试将文件b.png写入目录a当然不存在。
只需删除此类字符:
return title.replace(/[\\\/:]/g, "_") + ".png";