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;
}
}
};
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
原文：http://www.cnblogs.com/shiqiaoli/p/7058126.html