jquery轻量级可自定义的嵌套树插件

• Question 1?
  • Answer1
    • Question 1.1?
      • Answer 1.1
        • Question 1.1.1?
          • Answer 1.1.1 (LEAF)
          • Answer 1.1.2
            • Question 1.1.2.1?
              • Answer 1.1.2.1
                • Question 1.1.2.1.1?
                  • Answer 1.1.2.1.1 (LEAF)
  • Answer2
    • Question 2.1?
      • Answer 2.1.1 (LEAF)
  • Answer3 (LEAF)
  • Answer4
    • Question 4.1? (ERROR)