Replace("文字来源","被替代的文字","替代后的文字","从第几个字开始","总的替换次数")

Replace("A+S+B+G+K+J", "+", "-",1,2) = A-S-B+G+K+J
Replace("A+S+B+G+K+J", "+", "-",3,2) = S-B-G+K+J
Replace("A+S+B+G+K+J", "+", "-") = A-S-B-G-K-J    '默认所有