js how to implement drop-down control list

Specific implementation code: Category name Category Description Categorized products Existing products Huawei Xiaomi Hammer oppo >> >>> No product iPhone 6 Kidney 7 Nokia Waveguide << <<< Recommended tutorial: js introductory tutorial The above is the detailed content of how js implements the drop-down control list. For more, please pay attention to other related articles on 1024programmer.com!