我一直在用这个敲打我的头。
我使用phantomjs 1.9.8
在casperjs 1.1.0-beta3上运行我正在尝试从网址捕获图片并将其保存为文件。
这是我的命令:
casperjs --proxy-type=none --ssl-protocol=any /home/casper-capture.js http://url.com/demo/demo /home/demoScreenshot.png
这是我的 casper-capture.js
/**
* capture image from url and save it to file.
**/
var casper = require('casper').create({
verbose: true,
logLevel: "debug",
viewportSize: {
width: 2300,
height: 1200
},
pageSettings: {
webSecurityEnabled: false,
loadImages: true, // The WebPage instance used by Casper will
loadPlugins: true // use these settings
}
});
// delay before image capturing
var delay = 60000;
//timeout delay for loading
var timeoutForLoading = 10 * 60000;
// image source url.
var url = casper.cli.args[0];
// image output path
var path = casper.cli.args[1];
casper.start().zoom(4).thenOpen(url, function urlCaptureClouser() {
this.wait(delay, function(){
casper.waitFor(function check() {
return this.evaluate(function() {
return document.querySelectorAll('.fa-spin').length +
document.querySelectorAll('.chart-loading').length == 0;
});
}, function then() {
this.capture(path);
}, function then() {
this.capture(path);
}, timeoutForLoading);
});
});
casper.run();
我得到一个“空白”屏幕。 : - (
当我在本地系统上运行它时。有用!我不确定我做错了什么。
有人可以指出我的问题吗?
控制台日志(带有错误记录):
[info] [phantom] Starting...
[info] [phantom] Running suite: 2 steps
[debug] [phantom] opening url: <URL>, HTTP GET
[debug] [phantom] Navigation requested: url=<URL>, type=Other, willNavigate=true, isMainFrame=true
[debug] [phantom] url changed to "<URL>"
Error: TypeError: 'undefined' is not an object (evaluating 'Object.assign.apply')
[debug] [phantom] Successfully injected Casper client-side utilities
[info] [phantom] Step urlCaptureClouser 2/2 <URL> (HTTP 200)
[info] [phantom] Step urlCaptureClouser 2/2: done in 329ms.
[info] [phantom] Step _step 3/3 <URL> (HTTP 200)
[info] [phantom] Step _step 3/3: done in 351ms.
[info] [phantom] wait() finished waiting for 60000ms.
[info] [phantom] Step _step 4/4 <URL> (HTTP 200)
[info] [phantom] Step _step 4/4: done in 60358ms.
[info] [phantom] waitFor() finished in 41ms.
[info] [phantom] Step then 5/5 <URL> (HTTP 200)
[debug] [phantom] Capturing page to /home/dmeo1991.png
[info] [phantom] Capture saved to /home/dmeo1991.png
[info] [phantom] Step then 5/5: done in 60674ms.
[info] [phantom] Done 5 steps in 60674ms
Unsafe JavaScript attempt to access frame with URL about:blank from frame with URL file:///usr/lib/node_modules/casperjs/bin/bootstrap.js. Domains, protocols and ports must match.
答案 0 :(得分:2)
您的日志显示&#34;错误:TypeError:&#39; undefined&#39;不是一个对象(评估&#39; Object.assign.apply&#39;)&#34;这可能是一个空白屏幕,因为没有一个JavaScript实际执行。
您需要upgrade to PhantomJS 2.x(PhantomJS 1.x后面的引擎现在超过5年)或添加polyfill。我已经从MDN复制了polyfill:
casper.on('page.initialized', function(){
this.evaluate(function(){
// Polyfill...
if (typeof Object.assign != 'function') {
Object.assign = function(target) {
'use strict';
if (target == null) {
throw new TypeError('Cannot convert undefined or null to object');
}
target = Object(target);
for (var index = 1; index < arguments.length; index++) {
var source = arguments[index];
if (source != null) {
for (var key in source) {
if (Object.prototype.hasOwnProperty.call(source, key)) {
target[key] = source[key];
}
}
}
}
return target;
};
}
});
});
casper.start(...)...