提交初始版本，使用vant ui库

miniprogram_npm/@vant/weapp/tree-select/index.wxs

@@ -0,0 +1,12 @@
+/* eslint-disable */
+var array = require('../wxs/array.wxs');
+
+function isActive (activeList, itemId) {
+  if (array.isArray(activeList)) {
+    return activeList.indexOf(itemId) > -1;
+  }
+
+  return activeList === itemId;
+}
+
+module.exports.isActive = isActive;