<el-form ref="formItem" :model="formItem" :rules="ruleItem" label-width="80px" size="mini" style="padding-right: 20px" @keyup.enter.native="KeyDown();">

<el-row>
  <el-col :xs="24" :sm="24" :md="24" :lg="24">
    <el-button id="login_btn" shape="circle" type="primary" :loading="loading"
               @click.native="handleSubmit('formItem')">
      <span v-if="!loading">{{ $t('lang.Login.loginButto') }}</span>
      <span v-else>{{ $t('lang.Login.loginStatus') }}</span>
    </el-button>
  </el-col>
</el-row>

</el-form>

KeyDown() {
  if(event.keyCode===13){
    var btn_login=document.getElementById("login_btn");//id为登录按钮id
    btn_login.focus();
    btn_login.click();
  }
},