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node_modules/vant/es/mixins/field.js

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+export var FieldMixin = {
+  inject: {
+    vanField: {
+      default: null
+    }
+  },
+  watch: {
+    value: function value() {
+      var field = this.vanField;
+
+      if (field) {
+        field.resetValidation();
+        field.validateWithTrigger('onChange');
+      }
+    }
+  },
+  created: function created() {
+    var field = this.vanField;
+
+    if (field && !field.children) {
+      field.children = this;
+    }
+  }
+};