text: import {fromJS} from 'immutable'
  import * as constants from './constants'
  
  const defaultState = fromJS({
      topicList:[
          {
              id: 1,
              title: '社会热点1',
              imgUrl:'https://upload-images.jianshu.io/upload_images/654237-fbb1ee27b04fcbd1.jpg?imageMogr2/auto-orient/'
          },
          {
              id: 2,
              title: '社会热点2',
              imgUrl:'https://upload-images.jianshu.io/upload_images/654237-fbb1ee27b04fcbd1.jpg?imageMogr2/auto-orient/'
          },
          {
              id: 3,
              title: '社会热点3',
              imgUrl:'https://upload-images.jianshu.io/upload_images/654237-fbb1ee27b04fcbd1.jpg?imageMogr2/auto-orient/'
          },
          {
              id: 4,
              title: '社会热点4',
              imgUrl:'https://upload-images.jianshu.io/upload_images/654237-fbb1ee27b04fcbd1.jpg?imageMogr2/auto-orient/'
          },
          {
              id: 5,
              title: '社会热点5',
              imgUrl:'https://upload-images.jianshu.io/upload_images/654237-fbb1ee27b04fcbd1.jpg?imageMogr2/auto-orient/'
          },
          {
              id: 1,
              title: '社会热点',
              imgUrl:'https://upload-images.jianshu.io/upload_images/654237-fbb1ee27b04fcbd1.jpg?imageMogr2/auto-orient/'
          },
          {
              id: 6,
              title: '社会热点6',
              imgUrl:'https://upload-images.jianshu.io/upload_images/654237-fbb1ee27b04fcbd1.jpg?imageMogr2/auto-orient/'
          }
      ]
  })
  
  export default (state = defaultState, action) => {
      switch (action.type) {
          default:
              return state;
      }
  }
  