## 问题描述:两张图片,一张是用户上传的图片,另一张是模板图,中间是透明的,可以制作相框,并保存。使用html2canvas对两个img标签进行截图。在写demo的时候html2canvas没有报错但是所截的是空白,若换成文字就可以。 ## 原因分析:找了半天才知道,如果截图部分包含图片的话,程序必须放在服务器下面进行,不然的话就是空图片。 - It will not work if you run this html file without any web server . If you are playing around on your PC then install XAMPP or any other web server (Easiest option http://www.apachefriends.org/en/xampp.html) and put the image , JavaScript and HTML code in C:\xampp\htdocs (if C dirive is your installation drive) and run using the server. I have tested it in Chrome and its working. ##代码实例" <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Document</title> <script src="js/jquery.js"></script> <script src="js/html2canvas.js"></script> <script src="js/canvas2image.js"></script></head><style type="text/css"> img{ width: 500px; height: 300px; position: fixed; } #p1{ height: 500px; width: 100%; } #p2{ position: fixed; bottom: 0; background: red; } </style><body> <p id="p1"> <img id="img1" src="img/01.jpg"> <img id="img2" src="img/02.jpg" style="width:300px"> </p> <p id="p2"></p></body><script type="text/javascript"> html2canvas($('#p1'), { onrendered: function(canvas) { var oImgPNG = Canvas2Image.saveAsPNG(canvas, true); $('#p1').hide(); $('#p2').html(oImgPNG); }, width: 500, height: 500 }); </script></html>" ## 效果展示- 没有服务器谷歌浏览器下![没有服务器谷歌浏览器下] (https://static.oschina.net/uploads/img/201601/08225723_ndxo.png "在这里输入图片标题") - 没有服务器火狐浏览器下![没有服务器火狐浏览器下] (https://static.oschina.net/uploads/img/201601/08225751_vJBo.png "在这里输入图片标题") ## 说明只要火狐浏览器下可以显示图片就可以说明程序几乎没有问题O(∩_∩)O哈哈~## 小弟才疏学浅,如有错误望大神指点,O(∩_∩)O

HTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.

HTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.

WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.

The role of HTML is to define the structure and content of a web page through tags and attributes. 1. HTML organizes content through tags such as , making it easy to read and understand. 2. Use semantic tags such as, etc. to enhance accessibility and SEO. 3. Optimizing HTML code can improve web page loading speed and user experience.

HTMLisaspecifictypeofcodefocusedonstructuringwebcontent,while"code"broadlyincludeslanguageslikeJavaScriptandPythonforfunctionality.1)HTMLdefineswebpagestructureusingtags.2)"Code"encompassesawiderrangeoflanguagesforlogicandinteract

HTML, CSS and JavaScript are the three pillars of web development. 1. HTML defines the web page structure and uses tags such as, etc. 2. CSS controls the web page style, using selectors and attributes such as color, font-size, etc. 3. JavaScript realizes dynamic effects and interaction, through event monitoring and DOM operations.

HTML defines the web structure, CSS is responsible for style and layout, and JavaScript gives dynamic interaction. The three perform their duties in web development and jointly build a colorful website.

HTML is suitable for beginners because it is simple and easy to learn and can quickly see results. 1) The learning curve of HTML is smooth and easy to get started. 2) Just master the basic tags to start creating web pages. 3) High flexibility and can be used in combination with CSS and JavaScript. 4) Rich learning resources and modern tools support the learning process.


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