图片网址到base64 网络图片输入网址到base64

chenyajun  2022-10-16 13:43:23  阅读 979 次 评论 0 条
<!DOCTYPE html>    <html>    <head>    <meta http-equiv="content-type" content="text/html; charset=UTF-8">    <meta name="robots" content="noindex, nofollow">    <meta name="googlebot" content="noindex, nofollow">    <script type="text/javascript" src="//code.jquery.com/jquery-2.0.2.js"></script>    <style type="text/css">    
        @import url('//netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css');    
        body {    
            padding: 20px;    
        }    
    </style>    <title>网络图片输入网址到base64</title>    </head>    <body>    <form class="form-horizontal" id="img2b64">    <h2>输入项</h2>    <div class="form-group">    <label class="col-sm-2 control-label">转换方式:</label>    <div class="col-sm-10">    <select class="form-control" name="convertType">    <option value="Canvas" selected>画布</option>    <option value="FileReader">FileReader</option>    </select>    </div>    </div>    <div class="form-group">    <label class="col-sm-2 control-label">URL:</label>    <div class="col-sm-10">    <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 />    </div>    </div>    <div class="form-group">    <div class="col-sm-offset-2 col-sm-10">    <input type="submit" class="btn btn-default">    </div>    </div>    </form>    <div class="output form-horizontal" style="display: none">    <hr>    <h2>输出项</h2>    <div>    <strong class="col-sm-2 text-right">通过以下方式转换:</strong>    <div class="col-sm-10">    <span class="convertType"></span>    </div>    </div>    <div>    <strong class="col-sm-2 text-right">尺寸:</strong>    <div class="col-sm-10">    <span class="size"></span>    </div>    </div>    <div>    <strong class="col-sm-2 text-right">文本:</strong>    <div class="col-sm-10">    <textarea class="form-control textbox"></textarea>    </div>    </div>    <div>    <strong class="col-sm-2 text-right">链接:</strong>    <div class="col-sm-10">    <a href="#" class="link">打开图片</a>    </div>    </div>    <div>    <strong class="col-sm-2 text-right">图片:</strong>    <div class="col-sm-10">    <img class="img">    </div>    </div>    </div>    <script>    $(function() {    
    function convertImgToDataURLviaCanvas(url, callback, outputFormat) {    
        var img = new Image();    
        img.crossOrigin = 'Anonymous';    
        img.onload = function() {    
            var canvas = document.createElement('CANVAS');    
            var ctx = canvas.getContext('2d');    
            var dataURL;    
            canvas.height = this.height;    
            canvas.width = this.width;    
            ctx.drawImage(this, 0, 0);    
            dataURL = canvas.toDataURL(outputFormat);    
            callback(dataURL);    
            canvas = null;    
        };    
        img.src = url;    
    }    
    function convertFileToDataURLviaFileReader(url, callback) {    
        var xhr = new XMLHttpRequest();    
        xhr.onload = function() {    
            var reader = new FileReader();    
            reader.onloadend = function() {    
                callback(reader.result);    
            }    
            reader.readAsDataURL(xhr.response);    
        };    
        xhr.open('GET', url);    
        xhr.responseType = 'blob';    
        xhr.send();    
    }    
    $('#img2b64').submit(function(event) {    
        var imageUrl = $(this).find('[name=url]').val();    
        var convertType = $(this).find('[name=convertType]').val();    
        var convertFunction = convertType === 'FileReader' ?    
            convertFileToDataURLviaFileReader :    
            convertImgToDataURLviaCanvas;    
        convertFunction(imageUrl, function(base64Img) {    
            $('.output')    
                .find('.textbox')    
                .val(base64Img)    
                .end()    
                .find('.link')    
                .attr('href', base64Img)    
                .end()    
                .find('.img')    
                .attr('src', base64Img)    
                .end()    
                .find('.size')    
                .text(base64Img.length)    
                .end()    
                .find('.convertType')    
                .text(convertType)    
                .end()    
                .show()    
        });    
        event.preventDefault();    
    });    });    </script>    </body>    </html>


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