vue-music 关于playlist （底部播放列表组件）

// actions.js

export const deleteSong = function({commit,state},song){
  let playlist = state.playList.slice();
  let sequenceList = state.sequenceList.slice();
  let currentIndex = state.currentIndex;
  let pIndex = findIndex(playlist,song);
  playlist.splice(pIndex,1);
  let sIndex = findIndex(sequenceList,song);
  sequenceList.splice(sIndex,1);

  if(currentIndex > pIndex || currentIndex == playlist.length){
    currentIndex--;
  }

  commit(types.SET_PLAYLIST,playlist)
  commit(types.SET_SEQUENCE_LIST,sequenceList)
  commit(types.SET_CURRENT_INDEX,currentIndex)

  // 如果删除列表为空
  if(!playlist.length){
    commit(types.SET_PLAYING_STATE,false)
  }else{
    commit(types.SET_PLAYING_STATE,true)
  }

}

export const deleteSongList = function({commit}){
  commit(types.SET_PLAYLIST,[])
  commit(types.SET_SEQUENCE_LIST,[])
  commit(types.SET_CURRENT_INDEX,-1)
  commit(types.SET_PLAYING_STATE,false)
}