为什么下面的代码可以在 Chrome 和 Firefox 中运行，但在 IE 中不行？我将如何解决这个问题？
我看不到任何输出错误。
相关的 jQuery
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$(".slidingDiv").hide();
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相关 HTML
<ul class="relatedInfoLinks">
<li><a class="drop show_hide" href="#drop">What are the new parts? </a>
<ul class="slidingDiv">
<li>CASR Part 61 – Flight Crew Licensing requirements</li>
<li>CASR Part 64 – Authorisations for non-licenced personnel to operate an aeronautical radio and taxi aircraft. </li>
<li>CASR Part 141 – Pilot flight training other than certain integrated training</li>
<li>CASR Part 142 – Integrated and Multi crew pilot flight training </li>
</ul>
</li>
<li><a class="drop show_hide" href="#drop">Where can I find the new regulations?</a>
<ul class="slidingDiv">
<li>The Regulations are housed on the Com Law website and can be accessed through links on the CASA home page. </li>
</ul>
</li>
<li><a class="drop show_hide" href="#drop">Why is CASA introducing these new regulations?</a>
<ul class="slidingDiv">
<li>align with the International Civil Aviation Organization standards and recommended practices (making licences more transportable for our crews and benefitting local training institutions by attracting foreign pilots to train in Australia),</li>
<li>strengthen licensing and training requirements through the introduction of multi-crew training and flight testing for air transport licences (those required to undertake passenger services) and increased requirements for co-pilots,</li>
<li>improved standards for training organisations with a strong focus on flight activity and aircraft specific competency and the need for greater organisational planning through the requirement for safety and quality assurance systems,</li>
<li>better alignment with modern vocational education and training requirements centred on structured and competency-based training, delivered by competent and qualified instructors and assessed against clearly defined standards, and</li>
<li>address Australian Transport Safety Bureau recommendations through introducing requirements for ratings for low level flying and additional requirements for night time visual flying.</li>
</ul>
</li>
<li><a class="drop show_hide" href="#drop">Is compliance to the regulations required today?</a>
<ul class="slidingDiv">
<li>The regulations commence on 4 December 2013, therefore no immediate action is required by the aviation industry. </li>
<li>During this period CASA will be developing the communication and education material, building processes, amending CASA procedures manuals and developing guidance material (sample expositions, acceptable means of compliance etc.) for use by industry.
<ul>
<li>Current flight crew license holders will be transitioned to the new Part 61 licence system over a four year period. </li>
<li>Current flight crew training organisations will be allowed three years to comply fully with the additional requirements of Part 141 and 142.</li>
</ul></li>
<li>For existing licence holders the licence they hold on 3 December will still meet the requirements on 4 December.</li>
</ul>
</li>
<li><a class="drop show_hide" href="#drop">What is happening before 4 December?</a>
<ul class="slidingDiv">
<li>In the transition period CASA will be further developing the industry advisory material and delivery training and education to key industry members who will be facilitating the implementation and transition. </li>
</ul>
</li>
<li><a class="drop show_hide" href="#drop">What if I want to know more? </a>
<ul class="slidingDiv">
<li>More detailed information can be found on the CASA website XXXXXXX and you can sign up to received updates on the transition to the new regulations. </li>
</ul>
</li>
</ul>
完整代码（来自浏览器）
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<div class="user"><strong>Hi, <a href="/mylinks/?pagetitle=Licencing Regulations">test site user</a></strong><br />
20/02/2013 12:12:06</div>
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<!-- Start of main content -->
<h1>Licencing Regulations</h1>
<h2>Key information</h2>
<p>Must-know facts</p>
<ul class="relatedInfoLinks">
<li><a href="http://www.casa.gov.au/scripts/nc.dll?WCMS:STANDARD::pc=PC_101335">Part 61 Flight crew licensing</a>
<ul><li class="level2"><a href="http://www.casa.gov.au/scripts/nc.dll?WCMS:STANDARD::pc=PC_101339">Part 61 impact on industry</a></li></ul></li>
<li><a href="http://www.casa.gov.au/scripts/nc.dll?WCMS:STANDARD::pc=PC_101336">Part 64 Authorisations for non-licensed personnel</a>
<ul><li class="level2"><a href="http://www.casa.gov.au/scripts/nc.dll?WCMS:STANDARD::pc=PC_101340">Part 64 impact on industry</a></li></ul></li>
<li><a href="http://www.casa.gov.au/scripts/nc.dll?WCMS:STANDARD::pc=PC_101337">Part 141 Pilot flight training other than certain integrated training</a>
<ul><li class="level2"><a href="http://www.casa.gov.au/scripts/nc.dll?WCMS:STANDARD::pc=PC_101341">Part 141 impact on industry</a></li></ul></li>
<li><a href="http://www.casa.gov.au/scripts/nc.dll?WCMS:STANDARD::pc=PC_101338">Part 142 Integrated and multi crew pilot flight training</a>
<ul><li class="level2"><a href="http://www.casa.gov.au/scripts/nc.dll?WCMS:STANDARD::pc=PC_101342">Part 142 impact on industry</a></li></ul></li>
</ul>
<h2>Key resources</h2>
<ul class="relatedInfoLinks">
<li><a href="/junk/cao/doc/FM_bulletin_2_print.pdf">Standards information on the CASA website</a></li>
<li><a href="/junk/cao/doc/FM_bulletin_2.pdf">External information on the CASA website </a></li>
</ul>
<h2>Contact Us</h2>
<ul class="relatedInfoLinks">
<li><a href="#">Project staff</a></li>
</ul>
<h2>Must-know facts</h2>
<ul class="relatedInfoLinks">
<li><a class="drop show_hide" href="#drop">What are the new parts? </a>
<ul class="slidingDiv">
<li>CASR Part 61 Flight Crew Licensing requirements</li>
<li>CASR Part 64 Authorisations for non-licenced personnel to operate an aeronautical radio and taxi aircraft. </li>
<li>CASR Part 141 Pilot flight training other than certain integrated training</li>
<li>CASR Part 142 Integrated and Multi crew pilot flight training </li>
</ul>
</li>
<li><a class="drop show_hide" href="#drop">Where can I find the new regulations?</a>
<ul class="slidingDiv">
<li>The Regulations are housed on the Com Law website and can be accessed through links on the CASA home page. </li>
</ul>
</li>
<li><a class="drop show_hide" href="#drop">Why is CASA introducing these new regulations?</a>
<ul class="slidingDiv">
<li>align with the International Civil Aviation Organization standards and recommended practices (making licences more transportable for our crews and benefitting local training institutions by attracting foreign pilots to train in Australia),</li>
<li>strengthen licensing and training requirements through the introduction of multi-crew training and flight testing for air transport licences (those required to undertake passenger services) and increased requirements for co-pilots,</li>
<li>improved standards for training organisations with a strong focus on flight activity and aircraft specific competency and the need for greater organisational planning through the requirement for safety and quality assurance systems,</li>
<li>better alignment with modern vocational education and training requirements centred on structured and competency-based training, delivered by competent and qualified instructors and assessed against clearly defined standards, and</li>
<li>address Australian Transport Safety Bureau recommendations through introducing requirements for ratings for low level flying and additional requirements for night time visual flying.</li>
</ul>
</li>
<li><a class="drop show_hide" href="#drop">Is compliance to the regulations required today?</a>
<ul class="slidingDiv">
<li>The regulations commence on 4 December 2013, therefore no immediate action is required by the aviation industry. </li>
<li>During this period CASA will be developing the communication and education material, building processes, amending CASA procedures manuals and developing guidance material (sample expositions, acceptable means of compliance etc.) for use by industry.
<ul>
<li>Current flight crew license holders will be transitioned to the new Part 61 licence system over a four year period. </li>
<li>Current flight crew training organisations will be allowed three years to comply fully with the additional requirements of Part 141 and 142.</li>
</ul></li>
<li>For existing licence holders the licence they hold on 3 December will still meet the requirements on 4 December.</li>
</ul>
</li>
<li><a class="drop show_hide" href="#drop">What is happening before 4 December?</a>
<ul class="slidingDiv">
<li>In the transition period CASA will be further developing the industry advisory material and delivery training and education to key industry members who will be facilitating the implementation and transition. </li>
</ul>
</li>
<li><a class="drop show_hide" href="#drop">What if I want to know more? </a>
<ul class="slidingDiv">
<li>More detailed information can be found on the CASA website XXXXXXX and you can sign up to received updates on the transition to the new regulations. </li>
</ul>
</li>
</ul>
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