ul#song
  li
      label
        input(type='checkbox',v-model='selectAll')
        span 全选
  li(v-for="song in songs")
      label
        input(type='checkbox', v-bind:value='song.id', v-model='song.checked')
        span(v-text='"歌曲" + song.name')
        a(v-on:mouseenter='onMouseEnter(song.id)', v-on:mouseleave='onMouseLeave', v-text=' "歌手" + song.singer')