extjs怎样做图片上传解决思路

    createToolbar : function(editor) 
    {
        HTMLEditor.superclass.createToolbar.call(this, editor);
        this.tb.insertButton(16, 
        {
            cls : "x-btn-icon",
            icon : "images/icos/addimage.gif",
            handler : this.addImage,
            tooltip :
            { 
                title:'AddImage',
                text:'插入图片'
            },
            scope : this
        });
        this.tb.insertButton(17, 
        {
            cls : "x-btn-icon",
            icon : "images/icos/addfile.gif",
            handler : this.addFile,
            tooltip :
            { 
                title:'AddFile',
                text:'插入xls、doc、rar文件'
            },
            scope : this
        });
        
        this.tb.insertButton(18, 
        {
            cls : "x-btn-icon",
            icon : "images/icos/comment_edit.gif",
            handler : this.addCode,
            tooltip :
            { 
                title:'AddCode',
                text:'引用格式'
            },
            scope : this
        });
        
    }
});
Ext.reg('StarHtmleditor', HTMLEditor);

//判断是否是图片类型
function CheckFileExt(extstr,exg)
{
    var extstr = extstr.substring(extstr.lastIndexOf(".")).toLowerCase();
    if (!extstr.match(exg)) {
        return false;
    }
    return true;
}