[3.1 基础语法](3.1%E5%9F%BA%E7%A1%80%E8%AF%AD%E6%B3%95.md) [3.2 对象](3.2%E5%AF%B9%E8%B1%A1.md) [3.3 DOM操作和事件](3.3DOM%E5%92%8C%E4%BA%8B%E4%BB%B6.md) [3.4 表单验证和正则表达式](3.4%E8%A1%A8%E5%8D%95%E9%AA%8C%E8%AF%81%E5%92%8C%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F.md) [3.5 BOM操作](3.5BOM%E6%93%8D%E4%BD%9C.md) [3.6 Ajax操作](3.6Ajax%E6%93%8D%E4%BD%9C.md) [3.7 综合案例-抢红包](3.7.md)