Reports

When you got a range object from selection(like `myRange=mySelection.getRangeAt(0)`), send the range to this function:

function getSelectedText(range: Range):string {
    const div = document.createElement('div');
    div.appendChild(range.cloneContents());
    // we need get style by window.getComputedStyle(), 
    // so, it must be append on dom tree.
    // here is <body>,or some where that user can't see.
    document.body.appendChild(div);
    const it = document.createNodeIterator(div);
    let i;
    while (i = it.nextNode()) {
        // remove `user-select:none` node
        if (i.nodeType === Node.ELEMENT_NODE && window.getComputedStyle(i).userSelect === 'none') i.remove();
    }
    const cpt: string = div.innerText;
    div.remove();
    return cpt;
}

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