[Canvas]canvas元素方法和DataURL、Blob

時間 2020-07-19

標籤 canvas 元素方法 dataurl blob 简体版

原文原文鏈接

這裏引用《HTML5 Canvas核心技術》一書中的表1-2，並稍做簡化。屬性描述 getContext() 返回與該Canvas元素相關的繪圖對象。 toDataURL(type,quality) 返回一個數據地址(dataURL)，type：image/jpeg或image/png toBlob(callback,type,args...) 建立一個用於表示此canvas元素圖像文件的B

>>阅读原文<<

1. [Canvas]canvas元素方法和DataURL、Blob
2. Blob/DataURL/canvas/image的相互轉換
3. js和jquery獲取元素的方法
4. video元素和audio元素
5. appium---元素定位方法
6. cssSelector元素定位方法
7. JavaScript：DOM、獲取元素方法
8. selenium元素定位方法
9. js獲取元素方法
10. js刪除元素方法
更多相關文章...
• RSS , <link>, 和 <description> 元素</a> - <a href="http://www.voidme.com/rss" target="_blank" title="RSS 教程"> RSS 教程</a></li> <li> • <a href="http://www.voidme.com/rss/rss-tag-title-link-description-channel" target="_blank" title="RSS <title>, <link>, 和 <description> 元素"> RSS <title>, <link>, 和 <description> 元素</a> - <a href="http://www.voidme.com/rss" target="_blank" title="RSS 教程"> RSS 教程</a></li> <li> • <a href="http://www.voidme.com/content/hupnxfxrhq" target="_blank" title="SpringBoot中properties文件不能自動提示解決方法"> SpringBoot中properties文件不能自動提示解決方法</a> </li> <li> • <a href="http://www.voidme.com/content/eygesaacbt-bsx" target="_blank" title="Git可視化極簡易教程 — Git GUI使用方法"> Git可視化極簡易教程 — Git GUI使用方法</a> </li> </ul> <div class="margin-top-20"></div> <div> <div></div> </div> <div class="margin-top-20"></div> <div class="relative">相關標籤/搜索</div> <ul> <a target='_blank' href="http://hk.javashuo.com/tag/dataurl" title="dataurl"> <span class="new-label">dataurl</span></a> <a target='_blank' href="http://hk.javashuo.com/tag/blob" title="blob"> <span class="new-label">blob</span></a> <a target='_blank' href="http://hk.javashuo.com/tag/%E5%85%83%E7%B4%A0" title="元素"> <span class="new-label">元素</span></a> <a target='_blank' href="http://hk.javashuo.com/tag/%E6%96%B9%E6%B3%95" title="方法"> <span class="new-label">方法</span></a> <a target='_blank' href="http://hk.javashuo.com/tag/%E5%BE%AE%E9%87%8F%E5%85%83%E7%B4%A0" title="微量元素"> <span class="new-label">微量元素</span></a> <a target='_blank' href="http://hk.javashuo.com/tag/%E5%85%83%E7%B4%A0%E7%AC%A6%E8%99%9F" title="元素符號"> <span class="new-label">元素符號</span></a> <a target='_blank' href="http://hk.javashuo.com/tag/iframe%E5%85%83%E7%B4%A0" title="iframe元素"> <span class="new-label">iframe元素</span></a> <a target='_blank' href="http://hk.javashuo.com/tag/script%E5%85%83%E7%B4%A0" title="script元素"> <span class="new-label">script元素</span></a> <a target='_blank' href="http://hk.javashuo.com/tag/blob%2Bredux" title="blob+redux"> <span class="new-label">blob+redux</span></a> <a href="http://www.voidme.com/xlink" target="_blank" title="XLink 和 XPointer 教程"> <span class="new-label">XLink 和 XPointer 教程</span></a> <a href="http://www.voidme.com/php" target="_blank" title="PHP教程"> <span class="new-label">PHP教程</span></a> <a href="http://www.voidme.com/mybatis" target="_blank" title="MyBatis教程"> <span class="new-label">MyBatis教程</span></a> <a href="http://www.voidme.com/tag/算法" target="_blank" title="算法"> <span class="new-label">算法</span></a> </ul> </div> <div class="article_social"> <div class="article_like"> <div class="circle circle-like" id="my_zan" data_id="eEvIVb6"></div> </div> <div class="clear"></div> <div class="share"> <span class="share-left bdsharebuttonbox" data-tag="share_1"> <a href="#" class="bds_more icon-share" data-cmd="more"> <span class="bds_count" data-cmd="count" title="累计分享0次">0</span> </a> </span> <div class="share-right action action-share bdsharebuttonbox" data-tag="share_1"> <span class="bdshare"> <a href="#" class="bds_sinaweibo icon-weibo" data-cmd="tsina" title="分享到新浪微博">分享到微博</a> <a href="#" class="bds_weixin icon-wechat" data-cmd="weixin" title="分享到微信">分享到微信</a> <a href="#" class="bds_qq icon-qq" data-cmd="sqq" title="分享到QQ好友">分享到QQ</a> </span> </div> </div> <div class="clear"></div> <div class="bottom_plink huodong-detail-plink-banner clearfix"> </div> </div> <script> $(function () { $("#originfo").text("https://blog.csdn.net/xujunxuan/article/details/72772986"); $("#originfo").hover(function () { $("#originfo").attr("href", "/link?url=https://blog.csdn.net/xujunxuan/article/details/72772986"); }, function () { $("#originfo").attr("href", "javascript:void()"); }); }); </script> <script src="http://static2.javashuo.com/static/script/article.js?time=1735430479762" type="text/javascript"></script> </div> <div class="span3 article_right_side"> <div class="right_top"> <div id="right_site_articles" class="article_detail_bg"> <div class="article-part-title"> <span>每日一句</span> </div> <ul class="side_article_list"> 每一个你不满意的现在，都有一个你没有努力的曾经。 </ul> </div><script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>  <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-6208739752673518" data-ad-slot="5830279121" data-ad-format="auto" data-full-width-responsive="true"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> <div id="right_site_articles"> <div class="article-part-title"> <span>最新文章</span> </div> <ul class="side_article_list"> <li class="side_article_list_item">1. <a href="http://hk.javashuo.com/article/p-riouufkg-xh.html" target="_blank" title="js中 charCodeAt"> js中 charCodeAt </a> </li> <li class="side_article_list_item">2. <a href="http://hk.javashuo.com/article/p-wkpndokp-xh.html" target="_blank" title="Android中通過ViewHelper.setTranslationY實現View移動控制（NineOldAndroids開源項目）"> Android中通過ViewHelper.setTranslationY實現View移動控制（NineOldAndroids開源項目） </a> </li> <li class="side_article_list_item">3. <a href="http://hk.javashuo.com/article/p-dfkbulae-xh.html" target="_blank" title="【Android】日常記錄：BottomNavigationView自定義樣式，修改點擊後圖片"> 【Android】日常記錄：BottomNavigationView自定義樣式，修改點擊後圖片 </a> </li> <li class="side_article_list_item">4. <a href="http://hk.javashuo.com/article/p-oqwsdzww-xh.html" target="_blank" title="maya 文件檢查 ui和數據分離（一）"> maya 文件檢查 ui和數據分離（一） </a> </li> <li class="side_article_list_item">5. <a href="http://hk.javashuo.com/article/p-ztehqihb-xh.html" target="_blank" title="eclipse 修改項目的jdk版本"> eclipse 修改項目的jdk版本 </a> </li> <li class="side_article_list_item">6. <a href="http://hk.javashuo.com/article/p-tnfrovvr-xh.html" target="_blank" title="Android InputMethod設置"> Android InputMethod設置 </a> </li> <li class="side_article_list_item">7. <a href="http://hk.javashuo.com/article/p-fphdckyp-xh.html" target="_blank" title="Simulink中Bus Selector出現很多? ? ?"> Simulink中Bus Selector出現很多? ? ? </a> </li> <li class="side_article_list_item">8. <a href="http://hk.javashuo.com/article/p-ktpyrvss-xh.html" target="_blank" title="【Openfire筆記】啓動Mac版Openfire時提示「系統偏好設置錯誤」"> 【Openfire筆記】啓動Mac版Openfire時提示「系統偏好設置錯誤」 </a> </li> <li class="side_article_list_item">9. <a href="http://hk.javashuo.com/article/p-vyhhxnew-xh.html" target="_blank" title="AutoPLP在偏好標籤中的生產與應用"> AutoPLP在偏好標籤中的生產與應用 </a> </li> <li class="side_article_list_item">10. <a href="http://hk.javashuo.com/article/p-xcldeyqk-xh.html" target="_blank" title="數據庫關閉的四種方式"> 數據庫關閉的四種方式 </a> </li> </ul> </div> </div> <div class="operate_zone"> <div id="right_site_articles" class="article_detail_bg margin-top10"> <div class="article-part-title"> <span><a href="/contact" target="_blank">本站公眾號</a></span> </div> <div class="side_article_list user-head"> <span style="color: #5ba607;font-size:14px;"> 歡迎關注本站公眾號,獲取更多信息</span><br/> <img src="http://open.weixin.qq.com/qr/code?username=develong"/> </div> </div> <div id="right_site_articles"> <div class="article-part-title"> <span>相關文章</span> </div> <ul class="side_article_list"> <li class="side_article_list_item">1. <a href="http://hk.javashuo.com/article/p-dxxagnrd-tv.html" target="_blank" title="[Canvas]canvas元素方法和DataURL、Blob"> [Canvas]canvas元素方法和DataURL、Blob </a> </li> <li class="side_article_list_item">2. <a href="http://hk.javashuo.com/article/p-ohvauvhu-ka.html" target="_blank" title="Blob/DataURL/canvas/image的相互轉換"> Blob/DataURL/canvas/image的相互轉換 </a> </li> <li class="side_article_list_item">3. <a href="http://hk.javashuo.com/article/p-bmaffwae-cq.html" target="_blank" title="js和jquery獲取元素的方法"> js和jquery獲取元素的方法 </a> </li> <li class="side_article_list_item">4. <a href="http://hk.javashuo.com/article/p-qgfcycya-cq.html" target="_blank" title="video元素和audio元素"> video元素和audio元素 </a> </li> <li class="side_article_list_item">5. <a href="http://hk.javashuo.com/article/p-yurbkkof-bc.html" target="_blank" title="appium---元素定位方法"> appium---元素定位方法 </a> </li> <li class="side_article_list_item">6. <a href="http://hk.javashuo.com/article/p-towxcdzd-on.html" target="_blank" title="cssSelector元素定位方法"> cssSelector元素定位方法 </a> </li> <li class="side_article_list_item">7. <a href="http://hk.javashuo.com/article/p-wnnmotug-pc.html" target="_blank" title="JavaScript：DOM、獲取元素方法"> JavaScript：DOM、獲取元素方法 </a> </li> <li class="side_article_list_item">8. <a href="http://hk.javashuo.com/article/p-ydkzxbxk-g.html" target="_blank" title="selenium元素定位方法"> selenium元素定位方法 </a> </li> <li class="side_article_list_item">9. <a href="http://hk.javashuo.com/article/p-dcbxdkac-nz.html" target="_blank" title="js獲取元素方法"> js獲取元素方法 </a> </li> <li class="side_article_list_item">10. <a href="http://hk.javashuo.com/article/p-yehcxwux-bn.html" target="_blank" title="js刪除元素方法"> js刪除元素方法 </a> </li> </ul> <div style='padding-left:10px;font-size:14px;padding-bottom:10px;'> <a href='http://hk.javashuo.com/relative/p-civjpmgt-my.html' target='_blank' title="[Canvas]canvas元素方法和DataURL、Blob 的相關文章"> >>更多相關文章<< </a> </div> </div> </div> </div> </div> <script type="text/javascript"> $('table').each(function (i) { var size = $(this).children().size(); if (size > 1) { $(this).attr('class', "table table-bordered"); } else if (size == 1) { var e11 = $(this).children(":first"); var e1 = e11[0]; var name = e1.nodeName.toLowerCase(); if ("tbody" == name) { if (e1.children.length > 1) { $(this).attr('class', "table table-bordered"); } else if (e1.children.length == 1) { var e12 = e1.children[0]; var name2 = e12.nodeName.toLowerCase(); if ("tr" == name2) { if (e12.children.length > 1) { $(this).attr('class', "table table-bordered"); } } } } } }); window.page = 0; window.last = 0; window.first = true; resize_article_image('#nei', 550); + (function($){ window._bd_share_config = { common: { "bdText": "【" + $("title").text() + "】" + $(".post-content p:lt(2)").text(), "bdMini": "2", "bdMiniList": false, "bdPic": $(".post-content img:first") ? $(".post-content img:first").attr("src") : "", "bdStyle": "0", "bdSize": "24" }, share: [{ bdCustomStyle: 'http://static2.javashuo.com/static/css/share.css' }], }; with(document) 0[(getElementsByTagName("head")[0] || body).appendChild(createElement("script")).src = "http://bdimg.share.baidu.com/static/api/js/share.js?cdnversion=" + ~ ( - new Date() / 36e5)]; })(window.jQuery); </script> </div> <script type="text/javascript" src="http://static2.javashuo.com/static/plugin/highlight/highlight.pack.js"></script> <link href="http://static2.javashuo.com/static/plugin/highlight/styles/docco.css" media="screen" rel="stylesheet" type="text/css" /> <script type="text/javascript"> $('pre').each(function(i, e) { hljs.highlightBlock(e, "<span class='indent'> </span>", false) }); </script> <div class="footer"> <div class="footer-inner" style="padding-top: 50px;padding-bottom: 50px"> <a href="http://hk.javashuo.com/contact" target="_blank">聯繫我們</a> <a href="http://hk.javashuo.com/search">最近搜索</a> <a href="http://hk.javashuo.com/recent">最新文章</a> <script type="text/javascript" src="https://v1.cnzz.com/z_stat.php?id=1279585947&web_id=1279585947"></script> <a href="https://beian.miit.gov.cn/" target="_blank">沪ICP备13005482号-10</a> <a href="http://www.voidme.com/mybatis" target="_blank">MyBatis教程</a> <a href="http://www.voidme.com/sql" target="_blank">SQL 教程</a> <a href="http://www.voidme.com/mysql" target="_blank">MySQL教程</a> <a href="http://www.voidme.com/java" target="_blank">Java 教程</a> <a href="http://www.voidme.com/thymeleaf" target="_blank">Thymeleaf 教程</a> <a href="http://www.voidme.com/hibernate" target="_blank">Hibernate教程</a> <a href="http://www.voidme.com/spring" target="_blank">Spring教程 </a> <a href="http://www.voidme.com/redis" target="_blank">Redis教程 </a> </div> <div style="display:none;"> <script> var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?2936bf9a19a3d5abb5c9c726af070b7c"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); </script> </div> </div> <script type="text/javascript" src="http://static2.javashuo.com/static/script/tip.js?time=1735430479762" async></script> </body> </html>