jquery中怎麽實現多級菜單動態效果

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<div?class="level_three_menu">C/C++</div>?

<div?class="level_three_menu">PHP</div>?

<div?class="level_three_menu">Python</div>?

<div?class="level_three_menu">Javascript</div>?

<div?class="level_three_menu">Object-C</div>?

<div?class="level_three_menu">Perl</div>?

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<div?class="level_two_menu">操作系統?

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<div?class="level_two_menu">數據庫?

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<div?class="level_three_menu">Oracle</div>?

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<div?class="level_one_menu">出版日期分類?

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<div?class="level_two_menu">2001</div>?

<div?class="level_two_menu">2000</div>?

<div?class="level_two_menu">2000年之前</div>?

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