style:树形下拉框的修改

@@ -10,6 +10,14 @@
   line-height: 16px;
 }
 
+.vue-treeselect--disabled .vue-treeselect__control {
+  background-color: #F5F7FA !important;
+}
+
+.vue-treeselect--disabled .vue-treeselect__single-value {
+  color: #909399 !important;
+}
+
 //input
 .el-input__inner {
   padding: 0 7px !important;