理解响应式设计的视口宽度 [英] understanding viewport width for responsive design

问题描述

在阅读了很多关于浏览器视口宽度问题后，我决定尝试一下，看看我是否理解了这个概念.

after reading a lot about browser viewport width issues, I concluded to make a trial to see that if I understood the concept.

我在下面使用了 javascript:此脚本打印您的视口宽度为 WidthxHeight"

I used javascript below: This script prints "Your viewport width is WidthxHeight"

元素 1:在 1920 x 1080 分辨率下，HP x2301 屏幕没有任何滚动条:JS 打印:您的视口宽度为 1920x955

Element 1: At a 1920 x 1080 resolution, HP x2301 screen without any scroll bar: JS printed: Your viewport width is 1920x955

元素 2:在 1920 x 1080 分辨率下，带有滚动条的 HP x2301 屏幕(我增加了页面的高度，有很多 lorem Ipsum 字符串段落):JS 打印:您的视口宽度为 1920x955

Element 2: At a 1920 x 1080 resolution, HP x2301 screen with scroll bar (I increased the height of page with lots of lorem Ipsum string paragraphs): JS printed: Your viewport width is 1920x955

Element3:在 Chrome 中，我检查了 element1 视图和 element2 视图.对于带有滚动条的元素 2，Chrome 将宽度写为 1903 像素，而不是 1920.

Element3: At Chrome, I inspected element1 view and element2 view. For element 2, with scroll bar, Chrome wrote width as 1903 pixel, not 1920.

我的问题是:

1. 为什么 element1 和 element2 的宽度相同?对于 element2，我期待 new width = (1920 - scroll bar width).例如，Chrome 在其检查工具中写入了 1903 像素.
2. 我在标题中将 <meta name="viewport" content="initial-scale=1, width=device-width"> 声明为元标记.在我的 CSS3 中，我声明了 @media screen and (max-width: 1000px) { change something for responseness } 因为我的目标是在浏览器的视口中响应，所以这2个组合好吗?在这一点上，我应该说我的视口定义和目标是没有垂直滚动条的纯显示宽度.根据我的理解，max-width:1000px 对我来说意味着:在纯显示宽度为 <=1000px
后立即响应布局

1. Why element1 and element2 gave the same width? For element2, I was expecting new width = (1920 - scroll bar width). For example Chrome wrote 1903 pixel in its inspection tool.
2. I declared <meta name="viewport" content="initial-scale=1, width=device-width"> in my header as a meta tag. And in my CSS3, I declared @media screen and (max-width: 1000px) { change something for responsiveness } Since my aim is to be responsive in browser's viewport, does these 2 combination OK? At this point I should say that my viewport definition and aim is pure display width without vertical scroll bar. Because of my understanding, max-width:1000px means to me: be responsive in layout just after pure display width is <=1000px

javascript 源链接是:http://andylangton.co.uk/blog/development/get-viewport-size-width-and-height-javascript

javascript source link is: http://andylangton.co.uk/blog/development/get-viewport-size-width-and-height-javascript

    <script type="text/javascript">
    <!--
     
     var viewportwidth;
     var viewportheight;
      
     // the more standards compliant browsers (mozilla/netscape/opera/IE7) use window.innerWidth and window.innerHeight
      
     if (typeof window.innerWidth != 'undefined')
     {
          viewportwidth = window.innerWidth,
          viewportheight = window.innerHeight
     }
      
    // IE6 in standards compliant mode (i.e. with a valid doctype as the first line in the document)
     
     else if (typeof document.documentElement != 'undefined'
         && typeof document.documentElement.clientWidth !=
         'undefined' && document.documentElement.clientWidth != 0)
     {
           viewportwidth = document.documentElement.clientWidth,
           viewportheight = document.documentElement.clientHeight
     }
      
     // older versions of IE
      
     else
     {
           viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
           viewportheight = document.getElementsByTagName('body')[0].clientHeight
     }
    document.write('<p>Your viewport width is '+viewportwidth+'x'+viewportheight+'</p>');
    //-->
    </script>

先谢谢你，问候

推荐答案

我明白了.

我更改了 JS 并获得了真实的视口宽度.

I changed the JS and got the true viewport width.

JS 所有者是来自 SO 家族的 Vilmantas Baranauskas.

JS owner is Vilmantas Baranauskas from SO family.

相关SO链接:使用jquery获取没有滚动条的浏览器视口的高度和宽度?

相关脚本:

    <script type="text/javascript">     
        var viewportHeight;
        var viewportWidth;
        if (document.compatMode === 'BackCompat') {
            viewportHeight = document.body.clientHeight;
            viewportWidth = document.body.clientWidth;
        } else {
            viewportHeight = document.documentElement.clientHeight;
            viewportWidth = document.documentElement.clientWidth;
        }
        document.write('<p>Your viewport width without scrollbars is '+viewportHeight+'x'+viewportWidth+'</p>');
    </script>

1903 像素宽度是正确的，因为我知道滚动条的标准宽度是 17 像素.

1903 pixel width is true since scroll-bar std width is 17px as I know.

我也建议任何人在 CSS Body 或 HTML 标签中使用 overflow-y:scroll; 代码来制作浏览器即使是空白的草稿网页，也始终显示滚动条.

I also recommend to any one to use overflow-y:scroll; code in CSS Body or HTML tag in order to make browser display the scrollbar always even if for a blank draft web page.

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