图片转换为base64

明天中秋了，先祝大家中秋快乐！哈哈，最近见有人在群里问怎么把图片转换成base64格式，之前刚好写过就把代码贴出来。
主要用到canvas中的toDataURL方法
 <!DOCTYPE html>

 <html>

     <head>

         <meta http-equiv="content-type" content="text/html; charset=UTF-8">

         <title>Image to Base64 - jsFiddle demo by handtrix</title>

         <script type='text/javascript' src='//code.jquery.com/jquery-2.0.2.js'></script>

         <link rel="stylesheet" type="text/css" href="/css/result-light.css" rel="external nofollow">

         <style type='text/css'>

             @import url('//netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css');

             body {

                 padding: 20px;

             }

         </style>

         <script type='text/javascript'>

             //<![CDATA[

             $(window).load(function() {

                 /**

                 * convertImgToBase64

                 * @param {String} url

                 * @param {Function} callback

                 * @param {String} [outputFormat='image/png']

                 * @author HaNdTriX

                 * @example

                 convertImgToBase64('http://goo.gl/AOxHAL', function(base64Img){

                 console.log('IMAGE:',base64Img);

                 })

                 */

                 function convertImgToBase64(url, callback, outputFormat) {

                     var canvas = document.createElement('CANVAS');

                     var ctx = canvas.getContext('2d');

                     var img = new Image;

                     img.crossOrigin = '*';

                     img.onload = function() {

                         canvas.height = img.height;

                         canvas.width = img.width;

                         ctx.drawImage(img, 0, 0);

                         var dataURL = canvas.toDataURL(outputFormat || 'image/png');

                         callback.call(this, dataURL);

                         canvas = null;

                     };

                     img.src = url;

                 }

                 $('#img2b64').submit(function(event) {

                     var imageUrl = $(this).find('input[name=url]').val();

                     console.log('imageUrl', imageUrl);

                     convertImgToBase64(imageUrl, function(base64Img) {

                         $('.output')

                             .find('textarea')

                             .val(base64Img)

                             .end()

                             .find('a')

                             .attr('href', base64Img)

                             .text(base64Img)

                             .end()

                             .find('img')

                             .attr('src', base64Img);

                     });

                     event.preventDefault();

                 });

             }); //]]>

         </script>

     </head>

     <body>

         <h2>Input</h2>

         <form class="input-group" id="img2b64">

             <input type="url" name="url" class="form-control" placeholder="Insert an IMAGE-URL" value="http://upload.wikimedia.org/wikipedia/commons/4/4a/Logo_2013_Google.png" required>

             <span class="input-group-btn">

               <input type="submit" class="btn btn-default">

             </span>

         </form>

         <hr>

         <h2>Output</h2>

         <div class="output">

             <textarea class="form-control"></textarea><br>

             <a></a><br><br>

             <img><br>

         </div>

     </body>

 </html>
可以直接复制到一个html中看下结果就是下边这样
巴特西

图片转换为base64

最新文章

热门文章
