各种字符串验证

//*去掉空格*/
String.prototype.Trim = function() {
	var m = this.match(/^\s*(\S+(\s+\S+)*)\s*$/);
	return (m == null) ? "" : m[1];
}
//*用户名判断 * 用户名由6到12位字母、数字组成* */
String.prototype.isUserName = function() {
	return (/^[a-zA-Z0-9]{6,12}$/.test(this.Trim()));
}
//*密码判断 * 密码由6到16位字母和数字组成* */
String.prototype.isPassword = function() {
	return (/^[a-zA-Z0-9]{6,16}$/.test(this.Trim()));
}
//*密码判断 * 密码由6到12位字母和数字组成* */
String.prototype.isEmpt = function() {
	if(this.Trim().length<1) 
		{return true ;}
	else 
		{return false ;}
}
//*判断是否为邮箱*/
String.prototype.isEmailAddress = function() {
	return (/^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/.test(this.Trim()));	        
}
//*判断是否为手机号码*/
String.prototype.isMobile = function() {
	return (/^(?:13\d|15\d|18\d)-?\d{5}(\d{3}|\*{3})$/.test(this.Trim()));
}
//*判断是否为数字组成的字符串*/
String.prototype.isNumber = function() {
	return (/^[0-9]*$/.test(this.Trim()));
}
//*判断是否为中文*/
String.prototype.isZhongWen = function() {
	return (/^[\u4e00-\u9fa5]{0,}$/.test(this.Trim()));
}
//*判断是否为邮编*/
String.prototype.isPostcode = function() {
	return (/^[0-9]{6}$/.test(this.Trim()));
}
//*判断是否为身份证*/
String.prototype.isID = function() {
	return (/^\d{15}|\d{18}$/.test(this.Trim()));
}
//*判断是否为两位小数的正实数*/
String.prototype.isNumPoint = function() {
	return (/^[0-9]+(.[0-9]{0,2})$/.test(this.Trim()));
}
//*判断是否为URL地址*/
String.prototype.isURL = function() {
	return (/^[a-zA-z]+:\/\/[^\s]*$/.test(this.Trim()));
}
//*判断是否为正整数*/
String.prototype.isPlus = function() {
	return (/^[0-9]+$/.test(this.Trim()));
}
//*判断字符由字母和数字组成*/
String.prototype.isCharAndNum = function() {
	return (/^[A-Za-z0-9]+$/.test(this.Trim()));
}
//*判断字符由字母组成*/
String.prototype.isCharStr = function() {
	return (/^([a-zA-z]+)$/.test(this.Trim()));

}
//*判断折扣*//
String.prototype.isDiscount = function() {
	return (/^[0]+\.?[0-9]+$/.test(this.Trim()));
}

String.prototype.isPlus = function() {
	return (/^[0-9]+$/.test(this.Trim()));
}

String.prototype.isPriceNumber = function() {
	return (/^\d+\.\d+$/.test(this.Trim()) || /^\d+$/.test(this.Trim()));
}
//*只能输入数字
function onlyNum() 
{ 
if(!(event.keyCode==46)&&!(event.keyCode==8)&&!(event.keyCode==37)&&!(event.keyCode==39)) 
if(!((event.keyCode>=48&&event.keyCode<=57)||(event.keyCode>=96&&event.keyCode<=105))) 
event.returnValue=false; 
}
//*只允许输入数字和小数点
function onlydouble(obj){ 
   obj.value = obj.value.replace(/[^\d.]/g,"");  //清除“数字”和“.”以外的字符 
   obj.value = obj.value.replace(/^\./g,"");  //验证第一个字符是数字而不是. 
   obj.value = obj.value.replace(/\.{2,}/g,"."); //只保留第一个. 清除多余的. 
   obj.value = obj.value.replace(".","$#$").replace(/\./g,"").replace("$#$","."); 
}
//*只能输入数字和字母
function onlyNumString(hehe)
{
  var pattern = /[^0-9a-zA-Z]/g;
   if(pattern.test(hehe.value))
  {
    hehe.value = hehe.value.replace(pattern,"");
  }
}
//只允许输入数字和中划线
function onlyNumLine(hehe)
{
  var pattern = /[^0-9-]/g;
   if(pattern.test(hehe.value))
  {
    hehe.value = hehe.value.replace(pattern,"");
  }
}
//只允许输入数字和"/"
function onlyNumLine2(hehe)
{
  var pattern = /[^0-9/]/g;
   if(pattern.test(hehe.value))
  {
    hehe.value = hehe.value.replace(pattern,"");
  }
}
//只允许输入数字和"/"和","
function onlyNumLine3(hehe)
{
  var pattern = /[^0-9-,]/g;
   if(pattern.test(hehe.value))
  {
    hehe.value = hehe.value.replace(pattern,"");
  }
}
//**比较两个日期的大小 时间格式 2009-01-01**/
function compareDateStr(dateStr1, dateStr2) {
	dateStr1 = convDate(dateStr1, "-");
	dateStr2 = convDate(dateStr2, "-");
	if (dateStr1 > dateStr2) {
		return 1;
	}else if(dateStr1 == dateStr2){
		return 0;
	}else{
		return -1;
	}
}
function convDate(sDate, sSep) {
    var tem = sDate.replace(sSep,"");
    return tem.replace(sSep,"");
}
//去除两头空格
function LRTrim(obj) {
	obj.value = obj.value.replace(/\s+$|^\s+/g,"");
}

// 去左空格
function LTrim(obj) {
	obj.value = obj.value.replace(/^\s+/,"");
}

// 去右空格
function RTrim(obj) {
	obj.value = obj.value.replace(/\s+$/,"");
} 
//过滤HTML代码
function RemoveHTML(obj){
		obj.value = obj.value.replace(/<\/?[^>]*>/g,''); //去除HTML tag
		//obj.value = obj.value.replace(/\s+$|^\s+/g,""); //去除两头空格
		//obj.value = obj.value.replace(/\n[\s| | ]*\r/g,'\n'); //去除多余空行
}

function checkPersonName(str){
    var str=str.substr(0,1); //截取用户提交的用户名的前两字节，也就是姓。 
    var surname="赵钱孙李周吴郑王冯陈褚卫蒋沈韩杨朱秦尤许何吕施张孔曹严华金魏陶姜戚谢邹喻柏水窦章云苏潘葛奚范彭郎鲁韦昌马苗凤花方俞任袁柳酆鲍史唐费廉岑薛雷贺倪汤滕殷罗毕郝邬安常乐于时傅皮卞齐康伍余元卜顾孟平黄和穆萧尹姚邵湛汪祁毛禹狄米贝明臧计伏成戴谈宋茅庞熊纪舒屈项祝董梁杜阮蓝闵席季麻强贾路娄危江童颜郭梅盛林***锺徐邱骆高夏蔡田樊胡凌霍虞万支柯昝管卢莫经房裘缪干解应宗丁宣贲邓郁单杭洪包诸左石崔吉钮龚程嵇邢滑裴陆荣翁荀羊於惠甄麴家封芮羿储靳汲邴糜松井段富巫乌焦巴弓牧隗山谷车侯宓蓬全郗班仰秋仲伊宫宁仇栾暴甘钭历戎祖武符刘景詹束龙叶幸司韶郜黎蓟溥印宿白怀蒲邰从鄂索咸籍赖卓蔺屠蒙池乔阳郁胥能苍双闻莘党翟谭贡劳逄姬申扶堵冉宰郦雍却璩桑桂濮牛寿通边扈燕冀僪浦尚农温别庄晏柴瞿阎充慕连茹习宦艾鱼容向古易慎戈廖庾终暨居衡步都耿满弘匡国文寇广禄阙东欧殳沃利蔚越夔隆师巩厍聂晁勾敖融冷訾辛阚那简饶空曾毋沙乜养鞠须丰巢关蒯相查后荆红游竺权逮盍益桓公岳"+
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    r=surname.search(str);// 查找字符串。
    if(r==-1)
    	return false
    else 
    	return true
}

String.prototype.isPersonName = function() {

	return checkPersonName(this);
}
String.prototype.exactLenght=function() {
    var len = 0;
    for (var i = 0; i < this.length; i++) {
        if (this.charCodeAt(i) > 255) len += 2; else len ++;
    }
    return len;
}