JavaScript实现手机号格式验证的简单示例

手机号：<input type="text" class="loginuser" placeholder="请输入您的手机号" id="uid" onblur="checkPhone()" />
        <span id="uidt" style="margin-left: 100px"></span>

 function checkPhone(){
    var phone = document.getElementById('uid').value;
    if(!(/^1[34578]\d{9}$/.test(phone))){
      return document.getElementById('uidt').innerHTML = '请输入正确的手机号';
      return false;
    }    else{return document.getElementById('uidt').innerHTML = 'ok';}
  }