摘要：
HTML <!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>省市联动</title></head><body> <select id="province"></select> <select id="city">< 阅读全文
摘要：
HTML <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>移动option</title> <style type="text/css"> select { width: 200px; } .box { 阅读全文