问TYPO3 8.7.13 - getArguments()不返回响应

EN

<f:form id="snippetSearchForm"
        action="search"
        controller="Snippets"
        extensionName="snippet_highlight_syntax"
        pluginName="feshs"
        name="searchSnippets"
        method="POST"
        pageType="5513">
    <f:form.textfield class="form-control" property="searchWords"/>
    <f:form.submit id="searchBtn" value="Search"/>
</f:form>

public function searchAction()
    {
        $arguments = $this->request->getArguments();
        \TYPO3\CMS\Extbase\Utility\DebuggerUtility::var_dump($arguments);
    }

$("#snippetSearchForm").submit(function (event) {
    event.preventDefault();
    var form = $(this);
    var action = form.attr("action"),
        method = form.attr("method"),
        data = form.serialize();

    $.ajax({
        url: action,
        type: method,
        data: data,
        cache: false
    }).done(function (data) {
        console.log(data);
    }).fail(function () {
        ( "div.tx-feshs" ).replaceWith("errorMessage");
    }).always(function () {

    });
});

index.php?id=148&type=5513&tx_snippet_highlight_syntax_feshs[action]=search&tx_snippet_highlight_syntax_feshs[controller]=Snippets&cHash=4662b6b5a3fa0dc4e590e8d5c90fa