学步园

function getSelectedText() {    //this function code is borrowed from: http://www.codetoad.com/javascript_get_selected_text.asp

    var txt = "";
    if (window.getSelection) {
        txt = window.getSelection();
    } else if (window.document.getSelection) {
        txt = window.document.getSelection();
    } else if (window.document.selection) {
        txt = window.document.selection.createRange().text;
    }
    return txt;
}