1.鼠标移入移出切换 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>tab切换</title> <style type="text/css"> * {padding: 0;margin: 0;} li {list-style: none;} .wrapper { margin: 0 auto; width: 100%; max-width: 1140px; } .tabbox { margin: 4