那些遇到过的问题

什么会导致HtmlUnit抛出40多个异常并在我尝试使用javascript加载页面时失败？

Zac*_*aro 4 java htmlunit

我正试图从历史书的网站上搜集练习测验,这样我就可以将它们组合成一个大的测试来学习.

页面在这里.

这一切都是由javascript,所以我试图HtmlUnit用来刮页.

我更像是一个Python人,因此我将初始代码设置为非常接近HtmlUnit的入门部分: 

import com.gargoylesoftware.htmlunit.*;
import com.gargoylesoftware.htmlunit.WebClient;
import com.gargoylesoftware.htmlunit.html.HtmlPage;

public class HelloWorld {
    public static void main(String[] args) throws Exception {
        homePage();
        System.out.println("Done.");
    }

    public static void homePage() throws Exception {
        final WebClient webClient = new WebClient();

        String url = "http://www.wwnorton.com/college/polisci/we-the-people8/shorter/ch/15/quiz.aspx";

        final HtmlPage page = webClient.getPage(url);

        System.out.println(page.asText());
        webClient.closeAllWindows();
    }
}
Run Code Online (Sandbox Code Playgroud)

在运行时,我得到以下打印输出:2013年4月27日下午12:50:16 

com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
WARNING: Obsolete content type encountered: 'application/x-javascript'.
Apr 27, 2013 12:50:16 PM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
WARNING: Obsolete content type encountered: 'application/x-javascript'.
Apr 27, 2013 12:50:16 PM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
WARNING: Obsolete content type encountered: 'application/x-javascript'.
Apr 27, 2013 12:50:16 PM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
WARNING: Obsolete content type encountered: 'application/x-javascript'.
Apr 27, 2013 12:50:16 PM com.gargoylesoftware.htmlunit.javascript.host.ActiveXObject jsConstructor
WARNING: Automation server can't create object for 'ShockwaveFlash.ShockwaveFlash'.
Apr 27, 2013 12:50:16 PM com.gargoylesoftware.htmlunit.javascript.StrictErrorReporter runtimeError
SEVERE: runtimeError: message=[Automation server can't create object for 'ShockwaveFlash.ShockwaveFlash'.] sourceName=[http://www.wwnorton.com/common/js/shadowbox/shadowbox.js] line=[8] lineSource=[null] lineOffset=[0]
Apr 27, 2013 12:50:16 PM com.gargoylesoftware.htmlunit.javascript.host.ActiveXObject jsConstructor
WARNING: Automation server can't create object for 'QuickTime.QuickTime'.
Apr 27, 2013 12:50:16 PM com.gargoylesoftware.htmlunit.javascript.StrictErrorReporter runtimeError
SEVERE: runtimeError: message=[Automation server can't create object for 'QuickTime.QuickTime'.] sourceName=[http://www.wwnorton.com/common/js/shadowbox/shadowbox.js] line=[8] lineSource=[null] lineOffset=[0]
Apr 27, 2013 12:50:16 PM com.gargoylesoftware.htmlunit.javascript.host.ActiveXObject jsConstructor
WARNING: Automation server can't create object for 'wmplayer.ocx'.
Apr 27, 2013 12:50:16 PM com.gargoylesoftware.htmlunit.javascript.StrictErrorReporter runtimeError
SEVERE: runtimeError: message=[Automation server can't create object for 'wmplayer.ocx'.] sourceName=[http://www.wwnorton.com/common/js/shadowbox/shadowbox.js] line=[8] lineSource=[null] lineOffset=[0]
Apr 27, 2013 12:50:16 PM com.gargoylesoftware.htmlunit.javascript.StrictErrorReporter runtimeError
SEVERE: runtimeError: message=[The data necessary to complete this operation is not yet available.] sourceName=[http://www.wwnorton.com/common/js/shadowbox/shadowbox.js] line=[8] lineSource=[null] lineOffset=[0]
Apr 27, 2013 12:50:16 PM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
WARNING: Obsolete content type encountered: 'application/x-javascript'.
Apr 27, 2013 12:50:17 PM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
WARNING: Obsolete content type encountered: 'application/x-javascript'.
Apr 27, 2013 12:50:17 PM com.gargoylesoftware.htmlunit.javascript.StrictErrorReporter runtimeError
SEVERE: runtimeError: message=[The data necessary to complete this operation is not yet available.] sourceName=[http://www.wwnorton.com/college/polisci/we-the-people8/shorter/ScriptResource.axd?d=_NFxbFNZD5BQbaNY82unni-tpvKHIpx_DFI8m05N9H4ZnCF8k_zg2bVneHOOjAQ58itL8--3tACMpiC67WkR4iVWW6J5oqm5iyilArcp1bA4Jl6UUf2tHGjuNfP4BmYCDciCRxCM3FV_f5qrDZM2IQ2&t=fffffffff9cbe881] line=[164] lineSource=[null] lineOffset=[0]
Apr 27, 2013 12:50:17 PM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
WARNING: Obsolete content type encountered: 'application/x-javascript'.
Apr 27, 2013 12:50:17 PM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
WARNING: Obsolete content type encountered: 'text/javascript'.
Apr 27, 2013 12:50:17 PM com.gargoylesoftware.htmlunit.javascript.host.html.HTMLDocument execCommand
WARNING: Nothing done for execCommand(BackgroundImageCache, ...) (feature not implemented)
Apr 27, 2013 12:50:17 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: 'http://www.wwnorton.com/common/css/ss2.0/base.css' [848:2] Error in style rule. (Invalid token "!important". Was expecting one of: <EOF>, <S>, <IDENT>, "}", ";".)
Apr 27, 2013 12:50:17 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: 'http://www.wwnorton.com/common/css/ss2.0/base.css' [848:2] Ignoring the following declarations in this rule.
Apr 27, 2013 12:50:17 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: 'http://www.wwnorton.com/common/css/min/reset-min.css' [57:1] Error in style rule. (Invalid token "*". Was expecting one of: <EOF>, <S>, <IDENT>, "}", ";".)
Apr 27, 2013 12:50:17 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: 'http://www.wwnorton.com/common/css/min/reset-min.css' [57:1] Ignoring the following declarations in this rule.
Apr 27, 2013 12:50:18 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: 'http://www.wwnorton.com/common/css/min/base-min.css' [8:580] Error in style rule. (Invalid token "*". Was expecting one of: <EOF>, <S>, <IDENT>, "}", ";".)
Apr 27, 2013 12:50:18 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: 'http://www.wwnorton.com/common/css/min/base-min.css' [8:580] Ignoring the following declarations in this rule.
Apr 27, 2013 12:50:18 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: 'http://www.wwnorton.com/common/css/min/fonts-min.css' [8:55] Error in style rule. (Invalid token "*". Was expecting one of: <EOF>, <S>, <IDENT>, "}", ";".)
Apr 27, 2013 12:50:18 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: 'http://www.wwnorton.com/common/css/min/fonts-min.css' [8:55] Ignoring the following declarations in this rule.
Apr 27, 2013 12:50:18 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: 'http://www.wwnorton.com/common/css/min/fonts-min.css' [8:237] Error in style rule. (Invalid token "*". Was expecting one of: <EOF>, <S>, <IDENT>, "}", ";".)
Apr 27, 2013 12:50:18 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: 'http://www.wwnorton.com/common/css/min/fonts-min.css' [8:237] Ignoring the following declarations in this rule.
Apr 27, 2013 12:50:18 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: 'http://www.wwnorton.com/college/polisci/we-the-people8/shorter/css/custom.css' [23:1] Error in style rule. (Invalid token "body". Was expecting one of: <S>, <LBRACE>, <COMMA>.)
Apr 27, 2013 12:50:18 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: 'http://www.wwnorton.com/college/polisci/we-the-people8/shorter/css/custom.css' [23:1] Ignoring the following declarations in this rule.
Apr 27, 2013 12:50:18 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: 'http://www.wwnorton.com/common/colorblindcss/ss2.0/style.css' [1:51] Error in style rule. (Invalid token "<EOF>". Was expecting one of: <S>, <LBRACE>, <COMMA>, <HASH>, ".", ":", "[", <S>.)
Apr 27, 2013 12:50:18 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: 'http://www.wwnorton.com/common/colorblindcss/ss2.0/style.css' [1:51] Ignoring the following declarations in this rule.
Exception in thread "main" ======= EXCEPTION START ========
Exception class=[java.lang.RuntimeException]
com.gargoylesoftware.htmlunit.ScriptException: Exception invoking setOuterHTML
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:669)
    at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:601)
    at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:507)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:555)
    at com.gargoylesoftware.htmlunit.html.HtmlPage.loadExternalJavaScriptFile(HtmlPage.java:1082)
    at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:399)
    at com.gargoylesoftware.htmlunit.html.HtmlScript$3.execute(HtmlScript.java:260)
    at com.gargoylesoftware.htmlunit.html.HtmlScript.onAllChildrenAddedToPage(HtmlScript.java:276)
    at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:676)
    at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
    at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:635)
    at org.cyberneko.html.HTMLTagBalancer.callEndElement(HTMLTagBalancer.java:1170)
    at org.cyberneko.html.HTMLTagBalancer.endElement(HTMLTagBalancer.java:1072)
    at org.cyberneko.html.filters.DefaultFilter.endElement(DefaultFilter.java:206)
    at org.cyberneko.html.filters.NamespaceBinder.endElement(NamespaceBinder.java:330)
    at org.cyberneko.html.HTMLScanner$ContentScanner.scanEndElement(HTMLScanner.java:3074)
    at org.cyberneko.html.HTMLScanner$ContentScanner.scan(HTMLScanner.java:2041)
    at org.cyberneko.html.HTMLScanner.scanDocument(HTMLScanner.java:918)
    at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:499)
    at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:452)
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.parse(HTMLParser.java:892)
    at com.gargoylesoftware.htmlunit.html.HTMLParser.parse(HTMLParser.java:241)
    at com.gargoylesoftware.htmlunit.html.HTMLParser.parseHtml(HTMLParser.java:187)
    at com.gargoylesoftware.htmlunit.DefaultPageCreator.createHtmlPage(DefaultPageCreator.java:268)
    at com.gargoylesoftware.htmlunit.DefaultPageCreator.createPage(DefaultPageCreator.java:156)
    at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:434)
    at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:309)
    at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:374)
    at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:359)
    at HelloWorld.homePage(HelloWorld.java:16)
    at HelloWorld.main(HelloWorld.java:7)
Caused by: java.lang.RuntimeException: Exception invoking setOuterHTML
    at net.sourceforge.htmlunit.corejs.javascript.MemberBox.invoke(MemberBox.java:148)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject$GetterSlot.setValue(ScriptableObject.java:295)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject$RelinkedSlot.setValue(ScriptableObject.java:368)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject.putImpl(ScriptableObject.java:2796)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject.put(ScriptableObject.java:521)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject.putProperty(ScriptableObject.java:2479)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.setObjectProp(ScriptRuntime.java:1569)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.setObjectProp(ScriptRuntime.java:1564)
    at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1253)
    at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:798)
    at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:105)
    at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.doTopCall(ContextFactory.java:405)
    at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:275)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3031)
    at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.exec(InterpretedFunction.java:115)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$3.doRun(JavaScriptEngine.java:546)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:654)
    ... 31 more
Caused by: java.lang.IllegalStateException: Previous sibling for HtmlDivision[<div style="height: 0px; overflow: hidden; border-top: solid black; border-top-width: thick;">] is null.
    at com.gargoylesoftware.htmlunit.html.DomNode.insertBefore(DomNode.java:1036)
    at com.gargoylesoftware.htmlunit.javascript.host.html.HTMLElement.setOuterHTML(HTMLElement.java:1067)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at net.sourceforge.htmlunit.corejs.javascript.MemberBox.invoke(MemberBox.java:120)
    ... 47 more
Enclosed exception: 
java.lang.RuntimeException: Exception invoking setOuterHTML
    at net.sourceforge.htmlunit.corejs.javascript.MemberBox.invoke(MemberBox.java:148)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject$GetterSlot.setValue(ScriptableObject.java:295)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject$RelinkedSlot.setValue(ScriptableObject.java:368)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject.putImpl(ScriptableObject.java:2796)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject.put(ScriptableObject.java:521)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject.putProperty(ScriptableObject.java:2479)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.setObjectProp(ScriptRuntime.java:1569)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.setObjectProp(ScriptRuntime.java:1564)
    at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1253)
    at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:798)
    at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:105)
    at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.doTopCall(ContextFactory.java:405)
    at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:275)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3031)
    at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.exec(InterpretedFunction.java:115)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$3.doRun(JavaScriptEngine.java:546)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:654)
    at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:601)
    at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:507)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:555)
    at com.gargoylesoftware.htmlunit.html.HtmlPage.loadExternalJavaScriptFile(HtmlPage.java:1082)
    at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:399)
    at com.gargoylesoftware.htmlunit.html.HtmlScript$3.execute(HtmlScript.java:260)
    at com.gargoylesoftware.htmlunit.html.HtmlScript.onAllChildrenAddedToPage(HtmlScript.java:276)
    at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:676)
    at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
    at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:635)
    at org.cyberneko.html.HTMLTagBalancer.callEndElement(HTMLTagBalancer.java:1170)
    at org.cyberneko.html.HTMLTagBalancer.endElement(HTMLTagBalancer.java:1072)
    at org.cyberneko.html.filters.DefaultFilter.endElement(DefaultFilter.java:206)
    at org.cyberneko.html.filters.NamespaceBinder.endElement(NamespaceBinder.java:330)
    at org.cyberneko.html.HTMLScanner$ContentScanner.scanEndElement(HTMLScanner.java:3074)
    at org.cyberneko.html.HTMLScanner$ContentScanner.scan(HTMLScanner.java:2041)
    at org.cyberneko.html.HTMLScanner.scanDocument(HTMLScanner.java:918)
    at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:499)
    at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:452)
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.parse(HTMLParser.java:892)
    at com.gargoylesoftware.htmlunit.html.HTMLParser.parse(HTMLParser.java:241)
    at com.gargoylesoftware.htmlunit.html.HTMLParser.parseHtml(HTMLParser.java:187)
    at com.gargoylesoftware.htmlunit.DefaultPageCreator.createHtmlPage(DefaultPageCreator.java:268)
    at com.gargoylesoftware.htmlunit.DefaultPageCreator.createPage(DefaultPageCreator.java:156)
    at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:434)
    at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:309)
    at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:374)
    at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:359)
    at HelloWorld.homePage(HelloWorld.java:16)
    at HelloWorld.main(HelloWorld.java:7)
Caused by: java.lang.IllegalStateException: Previous sibling for HtmlDivision[<div style="height: 0px; overflow: hidden; border-top: solid black; border-top-width: thick;">] is null.
    at com.gargoylesoftware.htmlunit.html.DomNode.insertBefore(DomNode.java:1036)
    at com.gargoylesoftware.htmlunit.javascript.host.html.HTMLElement.setOuterHTML(HTMLElement.java:1067)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at net.sourceforge.htmlunit.corejs.javascript.MemberBox.invoke(MemberBox.java:120)
    ... 47 more
======= EXCEPTION END ========
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导致所有这些异常的原因是什么？为什么我(貌似)无法打开页面？

编辑

我试图加载其他页面已经javascript带动菜单和得到了类似的输出.

然后我尝试简单地加载Yahoo.com. 

String url = "http://www.yahoo.com";

final HtmlPage page = webClient.getPage(url);

System.out.println(page.asText());
Run Code Online (Sandbox Code Playgroud)

这次没有错误,但page.asText()什么也没有回复..

Phi*_*art 7

您链接到的页面使用了一个Javascript来触发HtmlUnit中的错误(虽然没有找到任何打开的问题),或者对于非Webkit浏览器而言只是简单的破解(尽管在IE10中页面工作正常).

除非浏览器是"非Safari"(*),否则在此脚本的某处,某些元素的outerHTML属性设置为null:

if (!$telerik.isSafari) {
  c.outerHTML = null;
}
if (!$telerik.isSafari) {
  a.outerHTML = null;
}
Run Code Online (Sandbox Code Playgroud)

(*)其中"Safari"被揭示进一步下降实际意味着"基于Webkit":

$telerik.isChrome = Sys.Browser.agent == Sys.Browser.Chrome;
$telerik.isSafari4 = Sys.Browser.agent == Sys.Browser.WebKit && Sys.Browser.version >= 526;
$telerik.isSafari3 = Sys.Browser.agent == Sys.Browser.WebKit && Sys.Browser.version < 526 && Sys.Browser.version > 500;
$telerik.isSafari2 = Sys.Browser.agent == Sys.Browser.Safari;
$telerik.isSafari = $telerik.isSafari2 || $telerik.isSafari3 || $telerik.isSafari4 || $telerik.isChrome;
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我没有费心去弄清楚混淆的JS代码想要做什么outerHTML,但是在执行脚本时它确实无法通过HtmlUnit的DOM操作代码深入状态检查:

java.lang.RuntimeException: Exception invoking setOuterHTML
  at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:669)
  ...
Caused by: java.lang.IllegalStateException: Previous sibling for
    HtmlDivision[<div style="...">] is null.
  at com.gargoylesoftware.htmlunit.html.DomNode.insertBefore(DomNode.java:1036)
  at com.gargoylesoftware.htmlunit.javascript.host.html.HTMLElement.setOuterHTML(HTMLElement.java:1067)
  at ...
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告诉HtmlUnit识别为Chrome可以避免这两项outerHTML = null任务

WebClient client = new WebClient(BrowserVersion.CHROME);
...
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并产生明智的输出:

Chapter 15: The Federal Courts | We the People, 8e: W. W. Norton StudySpace
W.W. Norton & Company
Colorblind Mode: On | Off W. W. NORTON HOME | HELP | CREDITS
We the People, 8e: A W. W. Norton StudySpace
...
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追踪这是一件有趣的事情.

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