常用验证

//去左右空格
function trim(s){
  return rtrim(ltrim(s));
}
//去左空格
function ltrim(s){
  return s.replace( /^/s*/, “”);
}
//去右空格
function rtrim(s){
  return s.replace( //s*$/, “”);
}
//验证是否是空字符串
function isEmpty(s){
 s = trim(s);
 return s.length == 0;
}
//Email;
function isEmail(s){
 s = trim(s);
  var p = /^[_/.0-9a-z-]+@([0-9a-z][0-9a-z-]+/.){1,4}[a-z]{2,3}$/i;
  return p.test(s);
}
//是否数字
function isNumber(s){
 return !isNaN(s);
}
//颜色值
function isColor(s){
 s = trim(s);
 if (s.length !=7) return false;
 return s.search(//#[a-fA-F0-9]{6}/) != -1;
}
//去掉字符串首尾空格
String.prototype.Trim = function() {
  var m = this.match(/^/s*(/S+(/s+/S+)*)/s*$/);
  return (m == null) ? “” : m[1];
}
//验证合法手机号
String.prototype.isMobile = function() {
  return (/^(?:13/d|15[89])-?/d{5}(/d{3}|/*{3})$/.test(this.Trim()));
}
//身份证
function isCard(s){
 s = trim(s);
 var p = /^/d{15}(/d{2}[xX0-9])?$/;
 return p.test(s);
}
//URL;
function isURL(s){
 s = trim(s).toLowerCase();
 var p = /^http:////[A-Za-z0-9]+/.[A-Za-z0-9]+[//=/?%/-&_~`@[/]/’:+!]*([^<>/"/"])*$/;
 return p.test(s);
}
//Phone;
function isPhone(s){
 s = trim(s);
 var p = /^((/(/d{3}/))|(/d{3}/-))?(/(0/d{2,3}/)|0/d{2,3}-)?[1-9]/d{6,7}$/;
 return p.test(s);
}
//Zip;
function isZip(s){
 s = trim(s);
 var p = /^[1-9]/d{5}$/;
 return p.test(s);
}
//Double;
function isDouble(s){
 s = trim(s);
 var p = /^[-/+]?/d+(/./d+)?$/;
 return p.test(s);
}
//Integer;
function isInteger(s){
 s = trim(s);
 var p = /^[-/+]?/d+$/;
 return p.test(s);
}
//English;
function isEnglish(s){
 s = trim(s);
 var p = /^[A-Za-z]+$/;
 return p.test(s);
}
//中文
function isChinese(s){
 s = trim(s);
 var p = /^[/u0391-/uFFE5]+$/;
 return p.test(s);
}
//双字节
function isDoubleChar(s){
 var p = /^[^/x00-/xff]+$/;
 return p.test(s);
}
//含中文字符
function hasChineseChar(s){
 var p = /[^/x00-/xff]/;
 return p.test(s);
}
//类似银行帐号的验证
function hasAccountChar(s){
 var p = /^[a-zA-Z0-9][a-zA-Z0-9_-]{0,15}$/;
 return p.test(s);
}
//字符长度验证
function limitLen(s,Min,Max){
 s=trim(s);
 if(s==”") return false;
 if((s.length<Min)||(s.length>Max))
  return false;
 else
  return true;
}
From - http://www.ligaofeng.com/?cat=6