目录树展开收缩icon判断

@@ -77,7 +77,11 @@
 				></div>
 				<div
 					v-if="item.children==null"
-					class="reTree_icon reTree_expand_icon"
+					class="reTree_icon"
+					:class="{
+						reTree_default_icon: item.dm != 'G' && item.dm != 'J' && item.dm != 'Z',
+						reTree_expand_icon: item.dm == 'G' || item.dm == 'J' || item.dm == 'Z',
+					}"
 					:style="{
 						height: (size || 16 * 1.2) + 'px',
 						width: (size || 16 * 1.2) + 'px',