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<!DOCTYPE html><html><head> <meta charset="utf-8"> <title>点击按钮变跟页面展示内容</title> </head><body> <h1>我的第一段 JavaScript</h1> <p id="demo">JavaScript 能改变 HTM 阅读全文
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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv 阅读全文
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<!DOCTYPE html> <html lang="zh"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv 阅读全文
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偏移, 以任意边为基准,向中心放向偏移为正,不向中心方向方向偏移为负;left:20px; 指向右偏移20px;left:-20px; 指向左偏移20px; bottom:20px; 指向上边偏移20px;bottom:-20px; 指向下边偏移20px; 阅读全文
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<!DOCTYPE html> <html lang="zh"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv 阅读全文