清除Firefox中的选择

function smth() {
var container = null;
var newContainer = null;
if (window.getSelection) {  // all browsers, except IE before version 9
    alert(\"first if\");
    var selectionRange = window.getSelection();
    if (selectionRange.rangeCount > 0) {
        var range = selectionRange.getRangeAt(0);
        container = range.commonAncestorContainer;
        newContainer = container;
    }
}
else {
    if (document.selection) {   // Internet Explorer
        alert(\"second if\");
        var textRange = document.selection.createRange();
        container = textRange.parentElement();
    }
}

if (newContainer) {
    return newContainer.nodeName;
}
else {
    alert(\"Container object for the selection is not available!\");
}
}     

document.selection.clear ()