JavaScript form validates phone number via regular expression_javascript tips

JavaScript form verifies phone numbers and determines whether an input is a phone number, implemented through regular expressions.

Copy code The code is as follows:

//Check the phone number
function isTel(str ){
var reg=/^([0-9]|[-]) $/g ;
if(str.length<7 || str.length>18){
return false;
}
else{
return reg.exec(str);
}