[學習] Bootstrap 折叠（Collapse）插件

http://www.runoob.com/bootstrap/bootstrap-collapse-plugin.html

点击我进行展开，再次点击我进行折叠。第 1 部分--hide 方法

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点击我进行展开，再次点击我进行折叠。第 2 部分--show 方法

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点击我进行展开，再次点击我进行折叠。第 3 部分--toggle 方法

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点击我进行展开，再次点击我进行折叠。第 4 部分--options 方法

Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo.