如何仅使用浏览器本机对象从网站获取突出显示的文本？

function getSelectionText() {
    let text = "";

    if (window.getSelection) {
        text = window.getSelection().toString();
    } else if (document.selection && document.selection.type != "Control") {
        text = document.selection.createRange().text;
    }

    return text;
}

function getSelectionText() {
    let text = "";
    const activeElement = document.activeElement;

    if (
        (activeElement.tagName.toLowerCase() === "textarea") ||
        (activeElement.tagName.toLowerCase() === "input" && /^(?:text|search|password|tel|url)$/i.test(activeElement.type)) &&
        (typeof activeElement.selectionStart === "number")
    ) {
        text = activeElement.value.slice(activeElement.selectionStart, activeElement.selectionEnd);
    } else if (window.getSelection) {
        text = window.getSelection().toString();
    }

    return text;
}