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JavaScript如何实现点击下载图片
2501_92999019: <!DOCTYPE html> <html lang="zh-CN"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>初中英语基础知识思维导图</title> <style> body { font-family: 'Microsoft YaHei', Arial, sans-serif; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); margin: 0; padding: 20px; min-height: 100vh; } .container { max-width: 1200px; margin: 0 auto; background: white; border-radius: 15px; box-shadow: 0 10px 30px rgba(0,0,0,0.2); overflow: hidden; } .header { background: linear-gradient(135deg, #4CAF50, #45a049); color: white; padding: 30px; text-align: center; } .header h1 { margin: 0; font-size: 28px; font-weight: bold; } .mindmap-container { padding: 40px; display: flex; justify-content: center; align-items: center; min-height: 600px; } #mindmap { width: 100%; height: 600px; border: 1px solid #ddd; border-radius: 10px; } .controls { text-align: center; padding: 20px; background: #f8f9fa; border-top: 1px solid #eee; } .btn { display: inline-block; padding: 12px 24px; margin: 0 10px; background: #007bff; color: white; text-decoration: none; border-radius: 25px; font-size: 16px; transition: all 0.3s ease; border: none; cursor: pointer; } .btn:hover { background: #0056b3; transform: translateY(-2px); box-shadow: 0 5px 15px rgba(0,123,255,0.3); } .btn-success { background: #28a745; } .btn-success:hover { background: #1e7e34; } </style> </head> <body> <div class="container"> <div class="header"> <h1>📚 初中英语基础知识思维导图</h1> <p>全面覆盖初中英语核心知识点</p> </div> <div class="mindmap-container"> <div id="mindmap"></div> </div> <div class="controls"> <button class="btn" onclick="downloadImage()">📸 下载图片</button> <button class="btn btn-success" onclick="downloadCode()">💾 下载代码</button> <button class="btn" onclick="resetMindmap()">🔄 重置视图</button> </div> </div> <script src="https://unpkg.com/d3@7"></script> <script src="https://unpkg.com/markmap-lib@0.15.4/dist/browser/index.js"></script> <script src="https://unpkg.com/markmap-view@0.15.4/dist/browser/index.js"></script> <script> // 思维导图数据 const mindmapData = { "type": "heading", "depth": 0, "content": "初中英语基础知识", "children": [ { "type": "heading", "depth": 1, "content": "📖 词汇基础", "children": [ {"type": "list_item", "content": "中考词汇量：1600-1800个"}, {"type": "list_item", "content": "常用词根词缀"}, {"type": "list_item", "content": "同义词与反义词"}, {"type": "list_item", "content": "短语动词"}, {"type": "list_item", "content": "固定搭配"} ] }, { "type": "heading", "depth": 1, "content": "🔤 语法体系", "children": [ { "type": "heading", "depth": 2, "content": "词类", "children": [ {"type": "list_item", "content": "名词：可数/不可数、单复数"}, {"type": "list_item", "content": "代词：人称、物主、反身"}, {"type": "list_item", "content": "动词：及物/不及物、规则/不规则"}, {"type": "list_item", "content": "形容词/副词：比较级、最高级"}, {"type": "list_item", "content": "介词：时间、地点、方式"} ] }, { "type": "heading", "depth": 2, "content": "时态", "children": [ {"type": "list_item", "content": "一般现在时"}, {"type": "list_item", "content": "一般过去时"}, {"type": "list_item", "content": "一般将来时"}, {"type": "list_item", "content": "现在进行时"}, {"type": "list_item", "content": "过去进行时"}, {"type": "list_item", "content": "现在完成时"} ] }, { "type": "heading", "depth": 2, "content": "句子结构", "children": [ {"type": "list_item", "content": "陈述句"}, {"type": "list_item", "content": "疑问句"}, {"type": "list_item", "content": "祈使句"}, {"type": "list_item", "content": "感叹句"}, {"type": "list_item", "content": "复合句"} ] } ] }, { "type": "heading", "depth": 1, "content": "🗣️ 口语表达", "children": [ {"type": "list_item", "content": "日常对话场景"}, {"type": "list_item", "content": "问路指路"}, {"type": "list_item", "content": "购物砍价"}, {"type": "list_item", "content": "点餐用餐"}, {"type": "list_item", "content": "天气话题"} ] }, { "type": "heading", "depth": 1, "content": "📚 阅读理解", "children": [ {"type": "list_item", "content": "记叙文阅读技巧"}, {"type": "list_item", "content": "说明文阅读方法"}, {"type": "list_item", "content": "应用文阅读策略"}, {"type": "list_item", "content": "推理判断题"}, {"type": "list_item", "content": "主旨大意题"} ] }, { "type": "heading", "depth": 1, "content": "✍️ 写作技能", "children": [ {"type": "list_item", "content": "记叙文写作"}, {"type": "list_item", "content": "应用文写作"}, {"type": "list_item", "content": "看图作文"}, {"type": "list_item", "content": "书信格式"}, {"type": "list_item", "content": "作文模板"} ] }, { "type": "heading", "depth": 1, "content": "🎧 听力训练", "children": [ {"type": "list_item", "content": "数字听力"}, {"type": "list_item", "content": "场景对话"}, {"type": "list_item", "content": "短文理解"}, {"type": "list_item", "content": "信息提取"}, {"type": "list_item", "content": "听力技巧"} ] } ] }; // 初始化思维导图 let mm; function initMindmap() { const { Markmap } = window.markmap; const svg = document.querySelector('#mindmap'); mm = Markmap.create(svg, { duration: 500, initialExpandLevel: 2, color: (colorFn) => colorFn, maxWidth: 300, spacingHorizontal: 80, spacingVertical: 5, paddingX: 8 }, mindmapData); } // 下载图片功能 function downloadImage() { const svg = document.querySelector('#mindmap svg'); const svgData = new XMLSerializer().serializeToString(svg); const canvas = document.createElement('canvas'); const ctx = canvas.getContext('2d'); const img = new Image(); img.onload = function() { canvas.width = img.width; canvas.height = img.height; ctx.fillStyle = 'white'; ctx.fillRect(0, 0, canvas.width, canvas.height); ctx.drawImage(img, 0, 0); const a = document.createElement('a'); a.download = '初中英语思维导图.png'; a.href = canvas.toDataURL('image/png'); a.click(); }; img.src = 'data:image/svg+xml;base64,' + btoa(unescape(encodeURIComponent(svgData))); } // 下载代码功能 function downloadCode() { const htmlContent = ` <!DOCTYPE html> <html lang="zh-CN"> <head> <meta charset="UTF-8"> <title>初中英语思维导图</title> <script src="https://unpkg.com/d3@7"><\/script> <script src="https://unpkg.com/markmap-lib@0.15.4/dist/browser/index.js"><\/script> <script src="https://unpkg.com/markmap-view@0.15.4/d
phpcms新增分页样式
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