fix: radioGroup not take effect when value is the number 0 #226

Author: tangjinzhou

Diff for: components/radio/Group.jsx

@@ -4,18 +4,6 @@ import Radio from './Radio'
 import { getOptionProps, filterEmpty, hasProp } from '../_util/props-util'
 function noop () {}
 
-function getCheckedValue (children) {
-  let value = null
-  let matched = false
-  children.forEach((radio) => {
-    if (radio && radio.componentOptions && radio.componentOptions.propsData.checked) {
-      value = radio.componentOptions.propsData.value
-      matched = true
-    }
-  })
-  return matched ? { value } : undefined
-}
-
 export default {
   name: 'ARadioGroup',
   props: {
@@ -42,7 +30,7 @@ export default {
   data () {
     const { value, defaultValue } = this
     return {
-      stateValue: value || defaultValue,
+      stateValue: value === undefined ? defaultValue : value,
     }
   },
   model: {