获取div滚动条的宽度

获取滚动条的宽度：

function getScrollWidth() {
    var noScroll, scroll, oDiv = document.createElement('div');
    oDiv.style.cssText = 'position:absolute; top:-1000px;     100px; height:100px; overflow:hidden;';
    noScroll = document.body.appendChild(oDiv).clientWidth;
    oDiv.style.overflowY = 'scroll';
    scroll = oDiv.clientWidth;
    document.body.removeChild(oDiv);
    return noScroll-scroll;    
}

alert(getScrollWidth()); //chrome下是15，其余的为17