删除最后一个元素

src/actions/headergroup.js

@@ -6,3 +6,7 @@ export const cloneElement = (element) => ({
 export const deleteLastElement = () => ({
   type: 'DELETE_LAST_ELEMENT'
 })
+
+export const deleteElement = () => ({
+  type: 'DELETE_ELEMENT'
+})

src/components/ElementGroup.js

@@ -14,12 +14,6 @@ class ElementGroup extends React.Component {
     this.setState({elements: elements})
   }
 
-  // 返回element的index为-1, 删除最后一个元素
-  deleteLastElement() {
-    const elements = ReactAddonsUpdate(this.state.elements, { $splice: [[-1, 1]] })
-    this.setState({elements: elements})
-  }
-
   sidebar() {
     return document.getElementById('sidebar')
   }

src/reducers/headergroup.js

@@ -11,6 +11,10 @@ const headergroup = (state = init_state, action) => {
         ...state,
         action.element
       ]
+    case 'DELETE_LAST_ELEMENT':
+      return [
+        ...state.slice(0, -1),
+      ]
     default:
       return state
   }