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 window.innerWidth包含某些版本的Firefox中垂直滚动条的宽度： 
 
 https://developer.mozilla.org/en-US/docs/Web/API/window.innerWidth 
 
 然而，w3schools似乎不同意（它说它不包括滚动条的宽度）： 
 
 http://www.w3schools.com/jsref/prop_win_innerheight.asp 
 
 在Mozilla bug跟踪器中甚至有一个与此有关的错误： 
 
 https://bugzilla.mozilla.org/show_bug.cgi?id=156388#c14 
 
 上面的混淆已经被CSS3清除了一点，它有一个特定的属性来计算宽度， 框大小 。 像这样设置盒子大小： 
 
box-sizing: border-box
 
 以下是什么（引自w3schools）： 
 
 
 
 此元素上指定的宽度和高度（以及最小/最大属性）确定元素的边框。 也就是说，元素上指定的任何填充或边框都布局并在此指定的宽度和高度内绘制。 通过从指定的“宽度”和“高度”属性中减去相应边的边框和填充宽度来计算内容宽度和高度 
 
 
 您可以使用宽度：100％，但请记住，这将包括您获得的任何额外间距和填充 - 但是，在启用CSS3的浏览器中，使用正确的box-sizing属性解决此问题，如上所述。 所以，如果你有，比如说一个div： 
 
<div style="width:100%; padding: 20px;">
  <div style="width:100%; background:red">Test</div>
</div>
 
 根据CSS21规范，内部div将会出界。 这是一个说明这个问题的jsFiddle 。 
 
 因此，请确保您没有任何填充以避免此类问题。 
 
 如果你想使用jQuery来获取窗口的宽度，你可以使用jQuery的width（）方法（或css（“width”））。 

window.innerWidth includes the width of the vertical scrollbar in some versions of Firefox:
 
https://developer.mozilla.org/en-US/docs/Web/API/window.innerWidth
 
however, w3schools seems to disagree (it says it doesn't include the width of the scrollbar):
 
http://www.w3schools.com/jsref/prop_win_innerheight.asp
 
There's even a bug concerning this in the Mozilla bug tracker:
 
https://bugzilla.mozilla.org/show_bug.cgi?id=156388#c14
 
The confusion above has been cleared a bit with CSS3, which has a specific property to calculate widths, box-sizing. Set box-sizing like this:
 
box-sizing: border-box
 
Which does the following (quoted from w3schools):
 
 
 
The specified width and height (and min/max properties) on this element determine the border box of the element. That is, any padding or border specified on the element is laid out and drawn inside this specified width and height. The content width and height are calculated by subtracting the border and padding widths of the respective sides from the specified 'width' and 'height' properties
 
 
You can use width:100% as noted, but bear in mind that this will ALSO include any extra spacing and padding you got - however, in CSS3-enabled browsers, this is resolved with the correct box-sizing property, as noted above. So, if you got, say a div like:
 
<div style="width:100%; padding: 20px;">
  <div style="width:100%; background:red">Test</div>
</div>
 
The inner div will go off-bounds according to the CSS21 spec. Here's a jsFiddle that illustrates this problem.
 
So, make sure that you don't have any padding to avoid such issues.
 
If you want to use jQuery to get the width of the window, you could use jQuery's width() method (or css("width")).