fix: select option value support number 0

components/vc-menu/SubPopupMenu.jsx

@@ -45,7 +45,7 @@ export function saveRef (key, c) {
 export function getActiveKey (props, originalActiveKey) {
   let activeKey = originalActiveKey
   const { eventKey, defaultActiveFirst, children } = props
-  if (activeKey) {
+  if (activeKey !== undefined && activeKey !== null) {
     let found
     loopMenuItem(children, (c, i) => {
       const propsData = c.componentOptions.propsData || {}
@@ -205,7 +205,7 @@ const SubPopupMenu = {
 
     getEventKey () {
       // when eventKey not available ,it's menu and return menu id '0-menu-'
-      return this.eventKey || '0-menu-'
+      return this.eventKey !== undefined ? this.eventKey : '0-menu-'
     },
 
     getOpenTransitionName () {

components/vc-menu/util.js

@@ -3,7 +3,7 @@ export function noop () {
 
 export function getKeyFromChildrenIndex (child, menuEventKey, index) {
   const prefix = menuEventKey || ''
-  return child.key || `${prefix}item_${index}`
+  return child.key === undefined ? `${prefix}item_${index}` : child.key
 }
 
 export function getMenuIdFromSubMenuEventKey (eventKey) {

components/vc-select/DropdownMenu.jsx

@@ -126,7 +126,7 @@ export default {
         let clonedMenuItems = menuItems
         if (selectedKeys.length || firstActiveValue) {
           if (props.visible && !this.lastVisible) {
-            activeKeyProps.activeKey = selectedKeys[0] || firstActiveValue
+            activeKeyProps.activeKey = selectedKeys[0] !== undefined ? selectedKeys[0] : firstActiveValue
           }
           let foundFirst = false
           // set firstActiveItem via cloning menus

components/vc-select/util.js

@@ -122,7 +122,7 @@ export function getSelectKeys (menuItems, value) {
     } else {
       const itemValue = getValuePropValue(item)
       const itemKey = item.key
-      if (findIndexInValueBySingleValue(value, itemValue) !== -1 && itemKey) {
+      if (findIndexInValueBySingleValue(value, itemValue) !== -1 && itemKey !== undefined) {
         selectedKeys.push(itemKey)
       }
     }