JS 验证密码 不能为空，必须含有数字、字母、特殊字符,长度在8-12位

checkpassword = function(v){    var numasc = 0;        var charasc = 0;        var otherasc = 0;        if(0==v.length){            return "密码不能为空";        }else if(v.length<8||v.length>12){            return "密码至少8个字符,最多12个字符";        }else{            for (var i = 0; i < v.length; i++) {                var asciiNumber = v.substr(i, 1).charCodeAt();                if (asciiNumber >= 48 && asciiNumber <= 57) {                    numasc += 1;                }                if ((asciiNumber >= 65 && asciiNumber <= 90)||(asciiNumber >= 97 && asciiNumber <= 122)) {                    charasc += 1;                }                if ((asciiNumber >= 33 && asciiNumber <= 47)||(asciiNumber >= 58 && asciiNumber <= 64)||(asciiNumber >= 91 && asciiNumber <= 96)||(asciiNumber >= 123 && asciiNumber <= 126)) {                    otherasc += 1;                }            }            if(0==numasc)  {                return "密码必须含有数字";            }else if(0==charasc){                return "密码必须含有字母";            }else if(0==otherasc){                return "密码必须含有特殊字符";            }else{                return true;            }        }};