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node_modules/vant/es/radio/index.js

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+import { createNamespace } from '../utils';
+import { CheckboxMixin } from '../mixins/checkbox';
+
+var _createNamespace = createNamespace('radio'),
+    createComponent = _createNamespace[0],
+    bem = _createNamespace[1];
+
+export default createComponent({
+  mixins: [CheckboxMixin({
+    bem: bem,
+    role: 'radio',
+    parent: 'vanRadio'
+  })],
+  computed: {
+    currentValue: {
+      get: function get() {
+        return this.parent ? this.parent.value : this.value;
+      },
+      set: function set(val) {
+        (this.parent || this).$emit('input', val);
+      }
+    },
+    checked: function checked() {
+      return this.currentValue === this.name;
+    }
+  },
+  methods: {
+    toggle: function toggle() {
+      this.currentValue = this.name;
+    }
+  }
+});