get window scroll bar width

浏览器因为操作系统或者系统主题不同，导致当前窗口中的scrollbar的宽度不一致，在web应用中影响了页面布局，下述方法可以获取到当前浏览器的滚动条宽度：

function getScrollBarWidth () {
var inner = document.createElement('p');
inner.style.width = "100%";
inner.style.height = "200px";

var outer = document.createElement('div');
outer.style.position = "absolute";
outer.style.top = "0px";
outer.style.left = "0px";
outer.style.visibility = "hidden";
outer.style.width = "200px";
outer.style.height = "150px";
outer.style.overflow = "hidden";
outer.appendChild (inner);

document.body.appendChild (outer);
var w1 = inner.offsetWidth;
outer.style.overflow = 'scroll';
var w2 = inner.offsetWidth;
if (w1 == w2) w2 = outer.clientWidth;

document.body.removeChild (outer);

return (w1 - w2);
};

Reference:http://www.alexandre-gomes.com/?p=115
http://www.softcomplex.com/docs/get_window_size_and_scrollbar_position.html

对于inline elements使用的几点说明

对于inline elements：
1、设置margin-top, margin-bottom这二个属性是无效的，但是有margin-left, margin-right。
2、设置以下几个属性也是无效的：min-width, min-heigth, width, heigth, max-width, max-height，另width的几个属性应用于table rows也是无效的，而height的几个属性应用于table columns也是无效的。
3、对于vertical-align，则只能对inline elements和table-cell elements生效。

HowTo set width/height/font/fontSize of vim window

" set the screen width and height, the same as set columns and lines
win 80 25
" columns width of the display
" set co=80
" lines number of lines in the display
" set lines=24
" For Mac OS X you can use something like this: >
set guifont=Monaco:h12