JS Verify that the input is a mobile number

  Use JS to verify the input is a mobile phone number or phone number, here is a good example, interested friends can refer to the following

Code as follows:  code as follows: <script type= "Text/javascript" >  String.prototype.Trim = function () {  var m = This.mat CH (/^s* s+ (s+s+) *) s*$/);  return (M = = null)? ' ': m[1]; }  String.prototype.isMobile = function () {  return (/^ (?: 13d|15[89))-?d{5} (D{3}|*{3}). Test (this. Trim ()); }  String.prototype.isTel = function ()   { //"compatible Format: Country code (2 to 3 bits)-Zip code (2 to 3 digits)-Phone number (7 to 8 digits)-Extension number (3-bit) " //return (/^) ([0+]d{2,3}-)? ( 0d{2,3})? (d{7,8}) (-(D{3,}))? $/.test (this. Trim ()));  return (/^ ([0+]d{2,3}-)? 0d{2,3})-(d{7,8}) (-(D{3,})? $/.test (this. Trim ()); }  function Chkform () {  with (Document.form1) {  if (tel.value.isMobile () | | Tel.value.isTel ()) {  Tel.value = Tel.value.Trim ();  alert ("Your phone/mobile number is:" + tel.value);  return true;  }  Else {  alert ("Please enter the correct cell phone number or phone number nn for example: 13916752109 or 0712-3614072");  Tel.focus ();  return false; } } }  </script>  <form name= "Form1"Method= "POST" action= "" >  <input type= "Text" name= "tel" value= "13916752109" size= ""/>  <input Type= "button" value= "Test" onclick= "return Chkform ()"/>  </form>