[jsTree] Expand and collapse buttons.

Posted on 2015 年 12 月 21 日 by cowman.chiang 
<input type="button" value="Expand All" onclick="$(‘#jsTreeID').jstree('open_all');">
<input type="button" value="Collapse All" onclick="$('#jsTreeID').jstree('close_all');">

Ref: jsTree: adding Expand All and Collapse All buttons

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