jstree获取半选中节点的方法
$('#jstree1').jstree().get_undetermined();
返回一个数组,getPara();方法无法获取数组
get_undetermined ([full])
get an array of all nodes whose state is "undetermined"
full:
boolean
if set to `true` the returned array will consist of the full node objects, otherwise - only IDs will be returned
Returns
Array