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在写视图的时候发现，可以使用很多已经写好的class样式，比如class='oe_title',class='oe_link',class='btn' 等，class='btn' 是使用的Bootstrap的样式，哪里可以学习到class的样式有哪些。
class
class='oe_title',class='oe_link',class='btn'
class='btn'