我收到此错误“从来源'http://localhost/api/auth/register'对来自'http://127.0.0.1:8000'的XMLHttpRequest的访问已被CORS策略阻止：对预检请求的响应未通过访问控制检查：否' access-control-allow-origin'标头出现在所请求的资源上。“

<template>
    <div class="container mt-2">
                <form autocomplete="off" @submit.prevent="register" method="post">
                    <div class="form-group" v-bind:class="{ 'has-error': has_error && errors.email }">
                        <label for="email">E-mail</label>
                        <input type="email" id="email" class="form-control bg-light border-0 small" placeholder="user@example.com" v-model="email">
                        <span class="help-block" v-if="has_error && errors.email">{{ errors.email }}</span>
                    </div>
                    <div class="form-group" v-bind:class="{ 'has-error': has_error && errors.password }">
                        <label for="password">Password</label>
                        <input type="password" id="password" class="form-control bg-light border-0 small" v-model="password">
                        <span class="help-block" v-if="has_error && errors.password">{{ errors.password }}</span>
                    </div>
                    <div class="form-group" v-bind:class="{ 'has-error': has_error && errors.password }">
                        <label for="password_confirmation">Conform Password</label>
                        <input type="password" id="password_confirmation" class="form-control bg-light border-0 small" v-model="password_confirmation">
                    </div>
                     <div class="alert alert-danger" v-if="has_error && !success">
                      <p v-if="error == 'registration_validation_error'">Validation error</p>
                      <p v-else>Please fill all the fields to get registered</p>
                     </div>
                     <input type="hidden" name="_token" :value="csrf">
                    <div class="text-center pb-3">
                    <button type="submit" class="btn btn-success btn-sm" style="background-color:#00A7F5;border:none;">Register</button>
                    </div>
          </form>
    </div>
</template>
<script>
  export default {
    data() {
      return {
        email: '',password: '',password_confirmation: '',csrf: document.querySelector('meta[name="csrf-token"]').getattribute('content'),has_error: false,error: '',errors: {},success: false
      }
    },methods: {
      register() {
        var app = this
        this.$auth.register({
          data: {
            email: app.email,password: app.password,password_confirmation: app.password_confirmation
          },success: function () {
            app.success = true
          },error: function (res) {
            app.has_error = true
            app.error = res.response.error
            app.errors = res.response.errors || {}
          }
        })
      }
    }
  }
</script>

如果失败，则来自控制器的响应

 $a = Validator::make($request->all(),[
            'email' => 'required|email|unique:users','password'  => 'required|min:6|confirmed',]);
 if ($a->fails())
        {
            return response()->json([
                'status' => 'error','errors' => $a->errors()
            ],422);
        }

如果一切正常，那么

return response()->json(['status' => 'success'],200);

请让我知道这有什么问题，还有没有更好的方法来处理错误。请分享链接，我无法正确处理错误。 感谢所有帮助。