JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" value="eeee" id="fake" />
<input type="text" value="" id="tel" />
<input type="button" value="test" id="test" />
<span id='res'></span>

JavaScript

$(function () {
    regexp = /^([0-9] ?){7}[0-9]$/
    $('#test').on('click', function () {
 monreturn =0;
       //verif tel 
        telnr = $('#tel').val();
        if (regexp.test(telnr)) {
            $('#res').html('bon');
            } else {
            $('#res').html('mauvais');
            monreturn++;
        }
        
       //verif fake
        if( $('#fake').val().length==0){
                    monreturn++ ;}
        
        
        alert(monreturn==0?"Ok j'envoie":"Il y a des erreurs de saisie")
        
    })

})