.code-highlight {
  background-color: #eba612;
}
.code-readonly {
  background-color: #262523;
}
.not-active {
  background-color: #aca9a7;
}
<input class="li-input" type="tel" autocomplete='off' name="telInput" id="telInput" placeholder="请输入您的手机号">
$(document)
.on('input propertychange','#telInput',function (e) {
  if (e.type === "input" || e.orignalEvent.propertyName === "value") {
    console.log(this.value.length)
    if(this.value.length == 11){
      var myreg = /^1\d{10}$/;
      if(!myreg.test(this.value)){
        common.tips({msg:'请输入正确手机号'});
        return;
      }
      $('#getCodeBtn').removeClass('not-active').addClass('code-highlight');
      self.options.tel = true;
    }else{
      $('#getCodeBtn').addClass('not-active').removeClass('code-highlight');
      self.options.tel = false;
    }
  }
})