1 function isNumberOr_Letter(s){ 2     //var regu = "^[0-9a-zA-Z]{6,12}$";  //可以为全数字或全字母 3     var regu =/^(?!([a-zA-Z]+|\d+)$)[a-zA-Z\d]{6,12}$/; 4     var re = new RegExp(regu); 5     if (re.test(s)) {  6         return true;  7     }else{ 8         return false; 9      }10 }