查看jQuery file upload的image preview如何工作的

查看readme中的说明，

• JavaScript Load Image library v. 1.13.0+: Required for the image previews and resizing functionality.
• JavaScript Canvas to Blob polyfill v. 2.1.1+:Required for the image previews and resizing functionality.

注释掉这个js的引用

<!-- The Load Image plugin is included for the preview images and image resizing functionality -->
<!--<script src="//blueimp.github.io/JavaScript-Load-Image/js/load-image.all.min.js"></script>-->

然后发现错误在loadImage.parseMetaData，提示loadImage undefined

loadImageMetaData: function (data, options) {
                if (options.disabled) {
                    return data;
                }
                var that = this,
                    dfd = $.Deferred();
                loadImage.parseMetaData(data.files[data.index], function (result) {
                    $.extend(data, result);
                    dfd.resolveWith(that, [data]);
                }, options);
                return dfd.promise();
            },

 在loadImageMetaData函数前面，加上console.trace(); 刷新页面，再次尝试，然后查看stack trace

标签：jQuery,image,JavaScript,upload,dfd,loadImage,data,options
来源： https://www.cnblogs.com/chucklu/p/11088583.html