js一组验证函数

//字符处理;
//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*$/, "");
}
//验证信息;
//空字符值;
function isempty(s){
s = trim(s);
return s.length == 0;
}
//email;
function isemail(s){
s = trim(s);
var p = /^[_\.0-9a-z-]+@([0-9a-z][0-9a-z-]+\.){1,4}[a-z]{2,3}$/i;
return p.test(s);
}
//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;
}
//手机号码;
function ismobile(s){
s = trim(s);
var p = /13\d{9}/;
return p.test(s);
}
//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]+$/;
return p.test(s);
}
//含有中文字符
function haschinesechar(s){
var p = /[^\x00-\xff]/;
return p.test(s);
}
function hasaccountchar(s){
var p = /^[a-za-z0-9][a-za-z0-9_-]{0,15}$/;
return p.test(s);
}
function limitlen(s,min,max){
s=trim(s);
if(s=="") return false;
if((s.length<min)||(s.length>max))
return false;
else
return true;
}