初始化上傳cha'jianuploader = WebUploader.create({                                       auto: false,                                         fileVal:"uploadRaw",                        // swf文件路徑                     swf: '/webuploader/Uploader.swf',                                        server: '/back/raw/upload.do',                                         pick: '#filePicker',                                         accept: {                         title: 'Images',                         extensions: 'gif,jpg,jpeg,bmp,png',                         mimeTypes: 'image/*'                     },                     fileNumLimit: 5, //限制上傳個數(shù)                     fileSingleSizeLimit: 2048000,                      // 不壓縮image, 默認如果是jpeg，文件上傳前會壓縮一把再上傳！                     resize: false                 });然后我想在上傳前動態(tài)設(shè)置server和fileVal的值RAW_UPLOAD.upload = function () {                       //根據(jù)頁面條件設(shè)置server            //根據(jù)頁面條件設(shè)置fileVal                 uploader.upload();     });怎么弄，或者說可以動態(tài)設(shè)置么,我在API文檔上沒看到相應(yīng)的方法,求各位大神幫忙看看