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2024-09-27 02:06:13 +08:00
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rem: 一种新的尺寸单位
元素实际宽高(px) = 你设置的rem * html 上的font-size(浏览器默认16px)
1css 媒体查询
2js 检查屏幕dpi动态修改 font-siz