function checkPhone(phone,phoneError){
var phone1 = $("#"+phone).val();
if(!(/^1[3|4|5|7|8]\d{9}$/.test(phone1))){
// alert("手机号码有误,请重填");
$("#"+phoneError).show();
$("#"+phone).val('');
// $("#"+phone).focus();
}else{
$("#"+phoneError).hide();
}
}
<span><input type="text" name="sendPhone3" onblur="checkPhone('sendPhone3','sendPhone3Error')" id="sendPhone3" ></span>
<span class="hint2" id="sendPhone3Error"><img src=/pss_wrong.png' />"/>请注意为手机格式</span>