通过actions去改变歌曲的currentIndex,playlist和sequencelist
export const deleteSong = function ({commit, state}, song) {
let playList = state.playList.slice() // 创建数组副本,而不用改动原数组
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)
// 判断 如若所要删除的在正在播放的前面 那么,当前播放要减掉一
if (currentIndex > pIndex || currentIndex === playList.length) {
currentIndex--
}
commit(types.SET_PLAY_LIST, playList)
commit(types.SET_SEQUENCELIST, sequenceList)
commit(types.CURRENTINDEX, currentIndex)
// 如果全删完了 或者删除了最后一首歌
if (!playList.length) {
commit(types.SET_PLAYING_STATE, false) // 停止播放
} else {
commit(types.SET_PLAYING_STATE, true)
}
}
// 全部删除, 返回的是空数组
export const clearSongAll = function ({commit}) {
commit(types.SET_PLAY_LIST, [])
commit(types.SET_SEQUENCELIST, [])
commit(types.CURRENTINDEX, -1)
commit(types.SET_PLAYING_STATE, false)
}