JS验证字符串功能

//去除空格 function jsTrim(value) {   var reg = /^/S$/;   if (!value) return "";   if (value.length == 0)     return value;   else {     var lp, rp;     lp = 0; rp = value.length - 1;     while ((value.charAt(lp) == " " || (value.charCodeAt(lp) < 128 ? (reg.test(value.charAt(lp)) == false ? true : false) : false) || value.charAt(rp) == " " || (value.charCodeAt(rp) < 128 ? (reg.test(value.charAt(rp)) == false ? true : false) : false)) && rp >= lp) {       if (value.charAt(lp) == " " || value.charCodeAt(lp) < 128 ? (reg.test(value.charAt(lp)) == false ? true : false) : false)         lp++;       if (value.charAt(rp) == " " || value.charCodeAt(rp) < 128 ? (reg.test(value.charAt(rp)) == false ? true : false) : false)         rp--;     }     if (lp > rp)       return "";     else       return (value.substring(lp, rp + 1));   } } //字符串长度 function strlength(s) {   var s_length = s.length;   return s_length; } //手机号码验证函数 String.prototype.Trim = function() {   var m = this.match(/^/s*(/S+(/s+/S+)*)/s*$/);   return (m == null) ? "" : m[1]; } String.prototype.isMobile = function() {   return (/^(?:13/d|15/d|18/d|19/d|17/d|14/d)-?/d{5}(/d{3}|/*{3})$/.test(this.Trim())); } //*判别电话号码，手机号是否有效 //*返回 true:false //*/ function checkPhone(phone)   {   //验证电话号码手机号码，包含153，159号段   if (phone==""){   alert("电话号码不能为空！");    return false;   }   if (phone != ""){    var p1 = /^(([0/+]/d{2,3}-)?(0/d{2,3})-)?(/d{7,8})(-(/d{3,}))?$/;   var me = false;   if (p1.test(phone)) me=true;   if (!me){     //alert('对不起，您输入的电话号码有错误。区号和电话号码之间请用-分割');    return false;   }   }   return true;   }   //邮箱地址验证函数 function checkmail(mail) { //  var strr; //  re = /(/w+@/w+/./w+)(/.{0,1}/w*)(/.{0,1}/w*)/i; //  re.exec(mail); //  if (RegExp.$3 != "" && RegExp.$3 != "." && RegExp.$2 != ".") //    strr = RegExp.$1 + RegExp.$2 + RegExp.$3 //  else { //    if (RegExp.$2 != "" && RegExp.$2 != ".") //      strr = RegExp.$1 + RegExp.$2 //    else //      strr = RegExp.$1 //  } //  if (strr != mail) { return false } else { return true }   //  return true;   var remail = /^([a-zA-Z0-9_/./-])+/@(([a-zA-Z0-9/-])+/.)+([a-zA-Z0-9]{2,4})+$/;   return mail.match(remail); } //判断数字 function CheckNumber(n) {   var checkOK = "0123456789-.";   var allValid = true;   var decPoints = 0;   var allNum = "";   for (i = 0; i < n.length; i++) {     ch = n.charAt(i);     for (j = 0; j < checkOK.length; j++)       if (ch == checkOK.charAt(j))       break;     if (j == checkOK.length) {       allValid = false;       break;     }     if (ch == ".") {       allNum += ".";       decPoints++;     }     else       allNum += ch;   }   if (!allValid)     return false;   if (decPoints > 1)     return false;   return true; } //判断数字 function CheckN(n) {   var checkOK = "0123456789";   var allValid = true;   var decPoints = 0;   var allNum = "";   for (i = 0; i < n.length; i++) {     ch = n.charAt(i);     for (j = 0; j < checkOK.length; j++)       if (ch == checkOK.charAt(j))       break;     if (j == checkOK.length) {       allValid = false;       break;     }     if (ch == ".") {       allNum += ".";       decPoints++;     }     else       allNum += ch;   }   if (!allValid)     return false;   if (decPoints > 1)     return false;   return true; } var g_MINY = 1601; var g_MAXY = 4500; var rgMC = new Array(12); rgMC[0] = 31; rgMC[1] = 28; rgMC[2] = 31; rgMC[3] = 30; rgMC[4] = 31; rgMC[5] = 30; rgMC[6] = 31; rgMC[7] = 31; rgMC[8] = 30; rgMC[9] = 31; rgMC[10] = 30; rgMC[11] = 31; function isdigit(c) {   return (c >= '0' && c <= '9'); } function GetMonthCount(m, y) {   var c = rgMC[m - 1];   if ((2 == m) && IsLeapYear(y)) c++;   return c; } function atoi(s) {   var t = 0;   for (var i = 0; i < s.length; i++) {     var c = s.charAt(i);     if (!isdigit(c)) return t;     else t = t * 10 + (c - '0');   }   return t; } //判断日期 function CheckDate(t) {   var l = t.length;   if (0 == l) return false;   var cSp = '/0';   var sSp1 = '';   var sSp2 = '';   for (var i = 0; i < t.length; i++) {     var c = t.charAt(i);     if (c == ' ' || isdigit(c)) continue;     else if (cSp == '/0' && (c == '/' || c == '-' || c == '.')) {       cSp = c;       sSp1 = t.substring(i + 1, l);     }     else if (c == cSp) sSp2 = t.substring(i + 1, l);     else if (c != cSp) return false;   }   if (0 == sSp1.length) return false;   var m;   var d;   var y;   if (0 == sSp2.length) return false;   m = atoi(sSp1);   d = atoi(sSp2);   y = atoi(t);   if (y < 100) {     y = 1900 + y;     while (y < g_yLow) y = y + 100;   }   if (y < g_MINY || y > g_MAXY || m < 1 || m > 12) return false;   if (d < 1 || d > GetMonthCount(m, y)) return false;   g_month = m;   g_day = d;   g_year = y;   return true; } //验证字符串必须为数字字母组合 function isNumAndStr(elem){     var str = elem.value;     var regexpUperStr=/[A-Z]+/;    var reexpLowerStr=/[a-z]+/;    var regexpNum=//d+/;    var uperStrFlag = regexpUperStr.test(str);    var lowerStrFlag = reexpLowerStr.test(str);    var numFlag = regexpNum.test(str);    if((uperStrFlag&&lowerStrFlag)||(lowerStrFlag&&numFlag)||(uperStrFlag&&numFlag))      return true;    else     return false; } //验证字符串必须为数字跟字母的组合   function checkPSW(str) {   if (str != "") {     var p1 = /(?!^[0-9]*$)(?!^[a-zA-Z]*$)^([a-zA-Z0-9]{2,})$/;     var me = false;     if (p1.test(str)) me = true;     if (!me) {       return false;     }   }   return true; } //验证字符串必须为数字跟字母的组合   function checklen(str) {   if (str.length < 8 ) {       return false;     }   return true; } //单价 function ISprice(v) {   var Mreg = /^[0-9]{1,10}(/.[0-9]{1,3})?$/;   if (Mreg.test(v)) {     return true;   }   else {     return false;   } }