MULTI-FUNCTIONAL FLOOR MOP BRUSH BACKGROUND OF THE INVENTION a) Field of the Invention 5 The invention relates to a multi-functional floor mop brush, in which fastening slots for combining a mop cloth and a brush head are provided at a top surface of the brush head. Accordingly, the floor or wall is wiped using the characteristics of the mop cloth. b) Description of the Prior Art 10 Referring to FIG. 1, a conventional common floor brush mainly includes a brush head 1, and a connecting head 11 substantially inclined at an appropriate angle and connected to a handle 10. Bristles 12 are formed at a bottom of the brush head 10. With the inclined angle of the connecting head 11, the bristles 12 are kept as 15 perpendicular as possible to the floor while a user holds the handle 10 and cleans the floor to facilitate floor cleaning. Such floor brush substantially achieves an expected object regarding cleaning. However, the cleaning needs to be performed in conjunction with washing with water in order to achieve thorough cleaning effects. 20 Further, the floor remains wet (especially the bathroom) after 1 cleaning the floor, which may cause slipping accidents. An exhaust device is usually turned on to dry the floor, or a mop is used to mop the floor dry. Otherwise, if the bathroom stays humid for an extended period of time, not only dangers but also unpleasant odors may be 5 resulted. It is then necessary to mop the floor dry by a mop. However, using the mop may be quite inconvenient. To use the mop, a bucket is first prepared, and the mop needs to be left to dry after cleaning. Further, with a wet mop, it is even more difficult to completely mop the floor dry, giving the mop unsatisfactory ease of use. 10 SUMMARY OF THE INVENTION In view of the above, the present invention provides a floor mop brush for dry and wet uses. In addition to sweeping the floor clean with bristles, a mop cloth is used to quickly dry the floor to prevent slipping. Further, the floor mop brush of the present invention can also be applied 15 to clean dust at higher positions. Therefore, the present invention provides simple and convenient application, and is an improvement as an ideal floor mop brush. The present invention discloses a multi-functional floor mop brush, which is a dual-use brush capable of sweeping the floor while also 20 providing a floor mopping function. The multi-functional floor mop 2 brush mainly includes a brush head, a fastening slots and a mop cloth. The brush head includes bristles extending downwards, and a handle is disposed on the brush head for controlling motions of the brush head. A plurality of fastening slots are formed by connected positioning plates. 5 Between every two of the positioning plates is a gap for accommodating the mop cloth to clamp and position the mop floor in the fastening slots, and the mop cloth is then winded downwards to surround the bristles such that the other side of the mop cloth is also positioned in the corresponding fastening slot. At this point, the mop cloth is placed 10 exactly below the bristles to serve as a floor mop or a floor mop brush, such that a common floor brush is converted to a cleaning tool for wiping the floor or wall to provide a simple and convenient application. To use the floor mop brush, the mop cloth is winded below the bristles in a U-shaped form, and a user may directly contact the mop 15 cloth with the floor or wall to dry the floor or remove dust using the mop cloth. After wiping the floor, the mop cloth may be drawn from the fastening slots, rinsed clean or replaced by a new mop cloth, and then again inserted into the fastening slots to continue with subsequent cleaning operations. In the present invention, the brush head and the 20 mop cloth are combined and applied using the fastening slots, so that 3 the brush becomes a dual-use floor mop brush. When put to use, the bristles are applied to remove a large part of water, and the floor is dried using the mop cloth to prevent a wet floor without involving other cleaning tools. The prevent invention not only reduces a storage 5 space but also provides excellent effects. Further, the mop cloth may be repeatedly used soft mop cloth, or may be one-time disposable dusting paper, non-woven fabric or cleaning paper that is directly disposed after use. Whether the mop cloth is the repeatedly used soft mop cloth or the one-time disposable 10 dusting paper, non-woven fabric or cleaning paper, the mop cloth can be directly inserted into the fastening slots and fixed to the brush head. At this point, the application convenience of the brush head is employed to directly contact the mop cloth or dusting paper with the floor or wall, so as to easily move the handle to wipe off dust from the floor or wall with a 15 simple and easy application. The above and other aspects of the invention will become better understood with regard to the following detailed description of the preferred but non-limiting embodiments. The following description is made with reference to the accompanying drawings. 20 BRIEF DESCRIPTION OF THE DRAWINGS 4 FIG. 1 is an elevational view of a conventional floor brush; FIG. 2 is an exploded view of the present invention; FIG. 2A is an enlarged partial view of a fastening slot of the present invention; 5 FIG. 3 is a first motion diagram of clamping and fastening a mop cloth of the present invention; FIG. 4 is a second motion diagram of clamping and fastening a mop cloth of the present invention; FIG. 5 is a schematic diagram of an assembly of the present invention; 10 FIG. 6 is a diagram according to another embodiment of the present invention; FIG. 7 is a schematic diagram of the present invention brushing a wall; and FIG. 8 is a diagram of a handle according to another embodiment of the 15 present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The above and other aspects of the invention will become better understood with regard to the following detailed description of the preferred but non-limiting embodiments. The following description is 20 made with reference to the accompanying drawings. 5 Referring to FIG. 2 showing an exploded view of the present invention, a multi-functional floor mop brush mainly includes a brush head 21, fastening slots 22 and a mop cloth 23. The brush head 21 includes bristles 211 extending downwards, and a handle 24 that is 5 capable swinging left and right for controlling the motion of the brush head 21 is disposed on the brush head 21. A plurality of fastening slots 22 are provided at two sides of a top surface of the brush head 21. Referring to FIG. 2A at the same time, each of the fastening slots 22 is formed by connected flexible positioning plates 221, between every two 10 positioning plates 221 is a gap, and an opening 2211 is formed at a center. The opening 2211 is for accommodating the mop cloth 23, so as to clamp and position the mop cloth 23 in the fastening slots 22 using the positioning plates 221. Referring to FIG. 3 and FIG. 4, to insert the mop cloth 23 into the 15 fastening slots 22, the mop cloth 23 is placed on the fastening slot 22 and then pushed down into the opening 2211 of the fastening plates 221. Thus, the mop cloth 23 becomes accommodated in the fastening slot 22 and is clamped by the positioning plates 221 at the two sides, thereby securely positioning the mop cloth 23 in the fastening slot 22. 20 Referring to FIG. 5, to assemble the multi-functional floor mop 6 brush, one side of the mop cloth 23 is usually first inserted into the fastening slot 22 and then winded downward to surround the bristles 211, such that the other side of the mop cloth 23 is also positioned in the fastening slot 22 at the corresponding side. At this point, the mop 5 cloth 23 is exactly placed below the bristles 211 to allow the brush head 21 to serve as a floor mop or a floor mop brush 2. With the assembly method of the present invention, a common brush can be quickly converted to a cleaning tool for wiping the floor or wall to provide enhanced convenience and ease of use. 10 Again referring to FIG. 5, to use the floor mop brush 2, before the floor mop brush 2 is assembled, as bristles 211 are present at the bottom of the floor mop brush 2, the bristles 211 can be used by a user to remove a large part of water and dirt on the floor. After the above cleaning process, the floor usually remains wet. At this point, the mop 15 cloth 23 may be fastened in the fastening slots 22 at the brush head 21, in a way that the mop cloth 23 surrounds the bottom of the bristles 211 in a U-shape form. Thus, the user may directly contact the mop cloth 23 with the floor to wipe the floor with the mop cloth 23. After wiping the floor with the mop cloth 23, the mop cloth 23 can be drawn from the 20 fastening slots 22 by applying a slight force, rinsed clean, and again 7 fastened into the fastening slots 22 to continue subsequent cleaning operations, thereby quickly wiping the floor clean using the mop cloth 23. That is, the mop cloth 23 can be removed, cleaned and reassembled for use. Therefore, with one set of floor mop brush 2 purchased, the floor 5 mop brush 2 provides not only the function of a mop but also functions of a brush and a mop for wet and dry uses, giving optimal application flexibilities. Again referring to FIG. 5 as well as FIG. 6, the mop cloth 23 is soft mop cloth that may be repeatedly cleaned and used. Alternatively, the 10 mop cloth may also be one-time disposable dusting paper 231, non-woven fabric or cleaning paper that can be directly disposed after use. Whether the mop cloth 23 is repeatedly cleaned and used mop cloth, or the one-time disposable dusting paper 231, non-woven fabric or cleaning paper, the mop cloth 23 can be directly inserted into the 15 fastening slots 22 to be fixed with the brush head 21 (referring to FIG. 4). When the brush head 21 is covered by the dusting paper 231, the floor mop brush 2 can be used as a floor brush such that floor dust can be attached to the dusting paper 231, or even to brush a wall 4 (as shown in FIG.7). Usually, higher positions of the wall 4 are harder to clean. 20 However, with the floor mop brush 2 of the present invention, these 8 higher positions of the wall 4 can be easily wiped by easily moving the handle without involving a stool or a ladder, further providing application convenience. Therefore, the application range of the floor mop brush 2 is extensive and versatile. 5 It should be noted that, the application form of the floor mop brush 2 is not limited to implementation in conjunction with the handle 24 (referring to FIG. 6), and may also be implemented with a fixed handle 241, as shown in FIG. 8. Thus, a force can be applied more smoothly, and wall corners that are not easily cleaned can be cleaned according 10 to an angle of the fixed handle 241 to provide excellent effects. Further, the brush head 21 (referring to FIG. 5) can be similarly surrounded by repeatedly used mop cloth 23 or the one-time disposable dusting paper 231 (referring to FIG. 6), non-woven fabric or cleaning paper to provide simplicity and convenience in overall use. 15 In conclusion, in the present invention, by providing a plurality of fastening slots at the brush head, the mop cloth can be directly fastened in the fastening slots to form a multi-functional mop brush for wet and dry uses from the brush. Further, depending on user needs, mop cloth, dusting paper, cleaning paper or non-woven fabric may be incorporated 20 to wipe the floor or wall for a dusting effect, thereby providing enhanced 9 application flexibilities. Further, the present invention does not limit the form of the handle, which may be implemented by a fixed form or a movable form to work in conjunction with the brush head, thus making the overall implementation of the present invention extremely versatile 5 and flexible. While the invention has been described by way of example and in terms of the preferred embodiments, it is to be understood that the invention is not limited thereto. On the contrary, it is intended to cover various modifications and similar arrangements and procedures, and 10 the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures. 10