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JavaScript³£ÓÃÑéÖ¤º¯Êý
Òý×Ô:http://www.webdeveloping.cn/blog/?action=show&id=209
 //УÑéÊÇ·ñÈ«ÓÉÊý×Ö×é³É      
 function isDigit(s) {      
  var patrn=/^[0-9]{1,20}$/;      
  if (!patrn.exec(s)) return false      
  return true      
 }      
    
 //УÑéµÇ¼Ãû£ºÖ»ÄÜÊäÈë5-20¸öÒÔ×Öĸ¿ªÍ·¡¢¿É´øÊý×Ö¡¢“_”¡¢“.”µÄ×Ö´®    
 function isRegisterUserName(s) {      
  var patrn=/^[a-zA-Z]{1}([a-zA-Z0-9]|[._]){4,19}$/;      
  if (!patrn.exec(s)) return false      
  return true      
 }     
    
 //УÑéÓû§ÐÕÃû£ºÖ»ÄÜÊäÈë1-30¸öÒÔ×Öĸ¿ªÍ·µÄ×Ö´®      
 function isTrueName(s){      
  var patrn=/^[a-zA-Z]{1,30}$/;      
  if (!patrn.exec(s)) return false      
  return true      
 }      
    
 //УÑéÃÜÂ룺ֻÄÜÊäÈë6-20¸ö×Öĸ¡¢Êý×Ö¡¢Ï»®Ïß      
 function isPasswd(s){      
  var patrn=/^(\w){6,20}$/;      
  if (!patrn.exec(s)) return false      
  return true      
 }      
    
 //УÑéÆÕͨµç»°¡¢´«ÕæºÅÂ룺¿ÉÒÔ“+”¿ªÍ·£¬³ýÊý×ÖÍ⣬¿Éº¬ÓГ-”      
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