innerHTML属性的返回值类型是String类型吗?

为什么console.log(typeof eleInner);  得到的值是string,
但是console.log(eleInner instanceof String);得到的值却是false

<!DOCTYPE html><html><head>
    <title></title></head><body>
    <p>HelloWorld</p>

    <script type="text/javascript">
        var eleP = document.querySelector("p");        var eleInner = eleP.innerHTML;        console.log(typeof eleInner);  //string
        console.log(eleInner instanceof String);  //false

    </script></body></html>

杨__羊羊

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