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我有这个功能来访问 DeepL API

    function translator(inputText){
    var url = "https://api-free.deepl.com/v2/translate";

    var xhr = new XMLHttpRequest();
    xhr.open("POST", url);
    xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
    xhr.onreadystatechange = function () {
    if (xhr.readyState === 4) {
        console.log(xhr.status);
        console.log(xhr.responseText);
        
    }
    };

    var data = "auth_key=123456x&text="+inputText+"&target_lang=EN";

    xhr.send(data);
}

我想将返回的响应存储为字符串。这个怎么做?

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