ckeditor3.6.4上传本地图片预览框中显示不出来

html：

 <textarea cols="80" id="content" name="content" rows="10" ></textarea>

var lang = cookie==0?'en':(cookie==1?'zh-cn':'zh')
CKEDITOR.replace( 'content',
{
    skin : 'kama',
    language : lang
});


config.js:
CKEDITOR.editorConfig = function( config )
{
    config.removePlugins = 'elementspath';         
    config.width = '390px;'; // 宽度     
    config.height = '100px'; // 高度      
    //自定义toolbar
    config.toolbar = 'Full';
    config.toolbar_Full = [
        { name: 'basicstyles',items: ['Bold', 'Italic', 'Underline', 'Strike', 'Subscript', 'Superscript', '-', 'RemoveFormat']},
        {name: 'paragraph',items: ['NumberedList', 'BulletedList', '-', 'Outdent', 'Indent', '-', 'JustifyLeft', 'JustifyCenter', 'JustifyRight', 'JustifyBlock', '-', 'BidiLtr', 'BidiRtl']},
        {name: 'insert',items: ['Image']},
        { name: 'styles',items: ['Styles', 'Format', 'Font', 'FontSize']},
    ];
    config.toolbar_Basic = [['Bold', 'Italic', '-', 'NumberedList', 'BulletedList', '-', 'Link', 'Unlink', '-', 'About']];
};

返回的地址有问题，后台和前台路径胜读一般不一样，你服务器端要直接返回绝对路径，从网站根目录开始，如/upload/20161216/xxxxxxx.jpg