function (size) randomString { |
size = size || 6; |
var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789' , // 62个字符 |
maxNum = chars.length, |
ret = '' ; |
while (size > 0) { |
ret += chars.charAt(Math.floor(Math.random() * maxNum)); |
size--; |
} |
return ret; |
} |