function ImageFileResize(file, maxWidth, maxHeight, callback) {        var Img = new Image;        var canvas = document.createElement('canvas');        var ctx = canvas.getContext('2d');        Img.onload = function() {            if (Img.width>maxWidth || Img.height>maxHeight) {                var bili = Math.max(Img.width/maxWidth, Img.height/maxHeight);                canvas.width = Img.width/bili;                canvas.height = Img.height/bili;            }else{                canvas.width = Img.width;                canvas.height = Img.height;            }            ctx.drawImage(Img, 0, 0, Img.width, Img.height, 0, 0, canvas.width, canvas.height);//            $('body').append(canvas);            callback(canvas.toDataURL());        };        try{            Img.src = window.URL.createObjectURL(file);        }catch(err){            try{                Img.src = window.webkitURL.createObjectURL(file);            }catch(err){                alert(err.message);            }        }    }    $('.js-uploader').on('click', function () {        var $clickObj = $(this);        var $fileInput = $('');        $fileInput.on('change',function () {            $clickObj.text('正在上传...');            ImageFileResize($fileInput[0].files[0], 800, 800, function (dataUrl) {                $.ajax({                    type: "POST",                    url: "
    createMobileUrl('Upload')?>",                    data: {imgDatUrl:dataUrl},                    success : function (ret) {                        $clickObj.prev().remove();                        $clickObj.before(" ");                        $clickObj.next().val(ret.path);                        $clickObj.text('重新上传');                    },                    dataType : "json"                });            });        });        $fileInput.click();    });