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<span class="cline-any cline-no">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">/**
 * 背景音乐服务
 */
interface BgmItem {
  id: number;
  name: string;
  url: string;
  mood: string;
  duration: number;
  size?: number;
}
&nbsp;
<span class="cstat-no" title="statement not covered" >export class BgmService {</span>
  // 背景音乐数据
<span class="cstat-no" title="statement not covered" >  private bgmList: BgmItem[] = [</span>
<span class="cstat-no" title="statement not covered" >    { id: 1, name: '轻柔钢琴', url: 'https://example.com/bgm/light-piano.mp3', mood: '轻柔', duration: 180, size: 2400000 },</span>
<span class="cstat-no" title="statement not covered" >    { id: 2, name: '温暖弦乐', url: 'https://example.com/bgm/warm-strings.mp3', mood: '温暖', duration: 240, size: 3200000 },</span>
<span class="cstat-no" title="statement not covered" >    { id: 3, name: '自然雨声', url: 'https://example.com/bgm/rain-nature.mp3', mood: '自然', duration: 300, size: 4000000 },</span>
<span class="cstat-no" title="statement not covered" >    { id: 4, name: '咖啡馆氛围', url: 'https://example.com/bgm/cafe-ambient.mp3', mood: '氛围', duration: 200, size: 2600000 },</span>
<span class="cstat-no" title="statement not covered" >    { id: 5, name: '企业配乐', url: 'https://example.com/bgm/corporate.mp3', mood: '商务', duration: 150, size: 2000000 },</span>
<span class="cstat-no" title="statement not covered" >    { id: 6, name: '欢快节拍', url: 'https://example.com/bgm/upbeat.mp3', mood: '欢快', duration: 180, size: 2400000 },</span>
<span class="cstat-no" title="statement not covered" >    { id: 7, name: '抒情慢歌', url: 'https://example.com/bgm/ballad.mp3', mood: '抒情', duration: 220, size: 2900000 },</span>
<span class="cstat-no" title="statement not covered" >    { id: 8, name: '古风配乐', url: 'https://example.com/bgm/ancient-chinese.mp3', mood: '古风', duration: 260, size: 3400000 },</span>
<span class="cstat-no" title="statement not covered" >    { id: 9, name: '科技感', url: 'https://example.com/bgm/tech.mp3', mood: '科技', duration: 190, size: 2500000 },</span>
<span class="cstat-no" title="statement not covered" >    { id: 10, name: '儿童音乐', url: 'https://example.com/bgm/children.mp3', mood: '童趣', duration: 160, size: 2100000 },</span>
<span class="cstat-no" title="statement not covered" >  ];</span>
&nbsp;
  // 风格分类
<span class="cstat-no" title="statement not covered" >  private moods = ['轻柔', '温暖', '自然', '氛围', '商务', '欢快', '抒情', '古风', '科技', '童趣'];</span>
&nbsp;
  /**
   * 获取所有背景音乐
   */
<span class="cstat-no" title="statement not covered" >  getBgmList(): BgmItem[] {</span>
<span class="cstat-no" title="statement not covered" >    return this.bgmList;</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
  /**
   * 按风格筛选背景音乐
   */
<span class="cstat-no" title="statement not covered" >  getBgmByMood(mood: string): BgmItem[] {</span>
<span class="cstat-no" title="statement not covered" >    if (!mood) return this.bgmList;</span>
<span class="cstat-no" title="statement not covered" >    return this.bgmList.filter(bgm =&gt; bgm.mood === mood);</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
  /**
   * 获取单个背景音乐
   */
<span class="cstat-no" title="statement not covered" >  getBgmById(id: number): BgmItem | undefined {</span>
<span class="cstat-no" title="statement not covered" >    return this.bgmList.find(bgm =&gt; bgm.id === id);</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
  /**
   * 获取所有风格
   */
<span class="cstat-no" title="statement not covered" >  getMoods(): string[] {</span>
<span class="cstat-no" title="statement not covered" >    return this.moods;</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
  /**
   * 添加背景音乐
   */
<span class="cstat-no" title="statement not covered" >  addBgm(data: { name: string; url: string; mood: string; duration: number }): BgmItem {</span>
<span class="cstat-no" title="statement not covered" >    const newBgm: BgmItem = {</span>
<span class="cstat-no" title="statement not covered" >      id: this.bgmList.length + 1,</span>
<span class="cstat-no" title="statement not covered" >      ...data,</span>
<span class="cstat-no" title="statement not covered" >    };</span>
<span class="cstat-no" title="statement not covered" >    this.bgmList.push(newBgm);</span>
<span class="cstat-no" title="statement not covered" >    return newBgm;</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
  /**
   * 更新背景音乐
   */
<span class="cstat-no" title="statement not covered" >  updateBgm(id: number, data: Partial&lt;{ name: string; url: string; mood: string; duration: number; size: number }&gt;): BgmItem | null {</span>
<span class="cstat-no" title="statement not covered" >    const index = this.bgmList.findIndex(bgm =&gt; bgm.id === id);</span>
<span class="cstat-no" title="statement not covered" >    if (index === -1) return null;</span>
<span class="cstat-no" title="statement not covered" >    this.bgmList[index] = { ...this.bgmList[index], ...data };</span>
<span class="cstat-no" title="statement not covered" >    return this.bgmList[index];</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
  /**
   * 删除背景音乐
   */
<span class="cstat-no" title="statement not covered" >  deleteBgm(id: number): boolean {</span>
<span class="cstat-no" title="statement not covered" >    const index = this.bgmList.findIndex(bgm =&gt; bgm.id === id);</span>
<span class="cstat-no" title="statement not covered" >    if (index === -1) return false;</span>
<span class="cstat-no" title="statement not covered" >    this.bgmList.splice(index, 1);</span>
<span class="cstat-no" title="statement not covered" >    return true;</span>
<span class="cstat-no" title="statement not covered" >  }</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >export const bgmService = new BgmService();</span></pre></td></tr></table></pre>

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