add range method
add range method

wmydz1/leaf,catinred2/leaf,zhutaorun/leaf,horryq/leaf,w4ngyi/leaf,deliangyang/leaf,yangxianjun/leaf,name5566/leaf,freeznet/leaf,sinuos/leaf,abel/leaf,GangWang/leaf,gale320/leaf,linmingren/leaf,voidException/leaf