Input box, automatic fill spaces when you enter the phone number

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<input type="tel" name="" id="" value="" placeholder="请输入11位手机号码" class="tel" maxlength="13"/>

$('.tel').on('input',function(){
                    var tel=$(this);
                    if(tel.val().length == 3 || tel.val().length == 8){
                         var str = tel.val()+" ";
                        tel.val(str);
                    }
             });

effect: