向pick中添加style参数，缺省为webuploader-pick，设为''时，将不自动为pick元素添加webuploader-pick class属性，同时也不影响mouseover相关的事件，这样可以允许用户使用自已的控件样式。 使用示例为 pick:{id:'#picker', style:''}
向pick中添加style参数，缺省为webuploader-pick，设为''时，将不自动为pick元素添加webuploader-pick class属性，同时也不影响mouseover相关的事件，这样可以允许用户使用自已的控件样式。
使用示例为 pick:{id:'#picker', style:''}

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Markxuxiao/webuploader,ouyang90/webuploader,VioletLife/webuploader,tarobjtu/webuploader