js控制<span></span>顯示資訊

<span id='info2' style="color:red;font-size:12px;"></span>

$('#phone').blur(function(){
        phone=document.getElementById('phone').value;
        var info1=document.getElementById("info1");
        if(phone==''){
            info1.style.color='red'
 
;
            info1.innerHTML = '*手機號碼不能為空';
        }else{

            var reg=/^1[34578]\d{9}$/;
            if(!reg.test(phone)){
                info1.style.color='red';
                info1.innerHTML = '*手機號碼格式錯誤';
            }else{
                info1.style.color='green';
                info1.innerHTML = '*輸入正確'
 
;
            }
        }
    })