JS给指定的button创建上传操作

/****
 * 给指定的button创建上传操作
 */
;cpic.upload = function(attachButtonId, isRead) {
    var code = isRead?"ECM0002":"ECM0001";
    var formId = "_" + attachButtonId + (new Date()).getTime();
    var formUpload = '<form id="' + formId +'" fid="' + formId + '" action="'+addr+'" class="formUpload" style="display:none" method="post" target="_blank">'+
                         '<input type="hidden" name="format" value="xml" />'+
                        '<input type="hidden" name="code" value="' + code + '" />'+
                        '<textarea class="uploadxml" style="display: none" rows="1" cols="1" name="xml"></textarea>'+
                    '</form>';
    $(document.body).append(formUpload);
    $("#" + attachButtonId).click(function(){
        $("#" + formId)[0].submit();
    });
};