fix(radio): radio group support v-model when using group

Author: dolymood

src/components/radio/radio-group.vue

@@ -20,6 +20,11 @@
 
   export default {
     name: COMPONENT_NAME,
+    provide() {
+      return {
+        radioGroup: this
+      }
+    },
     props: {
       value: [String, Number],
       options: {

src/components/radio/radio.vue

@@ -18,6 +18,11 @@ const EVENT_INPUT = 'input'
 
 export default {
   name: COMPONENT_NAME,
+  inject: {
+    radioGroup: {
+      default: null
+    }
+  },
   props: {
     value: [String, Number],
     option: {
@@ -38,6 +43,21 @@ export default {
       radioValue: this.value
     }
   },
+  created() {
+    const radioGroup = this.radioGroup
+    if (radioGroup) {
+      this.radioValue = radioGroup.radioValue
+      this._cancelWatchGroup = this.$watch(() => {
+        return radioGroup.radioValue
+      }, (newValue) => {
+        this.radioValue = newValue
+      })
+    }
+  },
+  beforeDestroy() {
+    this._cancelWatchGroup && this._cancelWatchGroup()
+    this._cancelWatchGroup = null
+  },
   watch: {
     value(newV) {
       this.radioValue = newV
@@ -47,6 +67,9 @@ export default {
         newV = Number(newV)
       }
       this.$emit(EVENT_INPUT, newV)
+      if (this.radioGroup) {
+        this.radioGroup.radioValue = newV
+      }
     }
   },
   computed: {