Method updateBookSelects

js/ReadingSystem.js:201–215

* 更新所有课本选择器

()

   * 更新所有课本选择器
   */
  updateBookSelects() {
    if (!this.dom.bookSelects.length || !this.state.books.length) return;

    const options = this.state.books
      .filter((book) => book?.key && book?.title && book?.bookPath)
      .map((book) => `<option value="${book.key}">${book.title}</option>`)
      .join('');

    this.dom.bookSelects.forEach((select) => {
      setHTML(select, options);
      if (this.state.bookKey) {
        select.value = this.state.bookKey;
      }
    });
  }

  /**
   * 渲染空状态提示