=INDEX({1,2,3,4,5,6,7,8,9,0,"a","b","c","d","e","f","g","","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"},ROUND(RAND()*35+1,0))&INDEX({1,2,3,4,5,6,7,8,9,0,"a","b","c","d","e","f","g","","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"},ROUND(RAND()*35+1,0))&INDEX({1,2,3,4,5,6,7,8,9,0,"a","b","c","d","e","f","g","","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"},ROUND(RAND()*35+1,0))&INDEX({1,2,3,4,5,6,7,8,9,0,"a","b","c","d","e","f","g","","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"},ROUND(RAND()*35+1,0))&INDEX({1,2,3,4,5,6,7,8,9,0,"a","b","c","d","e","f","g","","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"},ROUND(RAND()*35+1,0))&INDEX({1,2,3,4,5,6,7,8,9,0,"a","b","c","d","e","f","g","","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"},ROUND(RAND()*35+1,0))
虽然有点长,但你可以看出是六位随机数并成的,如仍觉长,可以将10位数字,26*2个字母定义为一个区域,我这儿是一步到位