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index.vw.html
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index.vw.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>flexible layout</title>
<meta name="description" content="flexible layout with css vw" />
<meta name="keywords" content="flexible layout css" />
<meta name="viewport" content="width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no"/>
<link rel="stylesheet" href="index.vw.css">
</head>
<body>
<p class="show-label">screen: <span id="screen"></span>px</p>
<p class="show-label">window: <span id="window"></span>px</p>
<p class="show-label">viewport: <span id="viewport"></span>px</p>
<div class="wrapper">
<div class="item">
<img src="img/icon-driver.png" alt="" class="icon">
<span class="icon-label">司机</span>
</div>
<div class="item">
<img src="img/icon-material.png" alt="" class="icon">
<span class="icon-label">物料</span>
</div>
<div class="item">
<img src="img/icon-tour-entrance.png" alt="" class="icon">
<span class="icon-label">景区</span>
</div>
<div class="item">
<img src="img/icon-tour.png" alt="" class="icon">
<span class="icon-label">游客</span>
</div>
</div>
<script>
/**
* 从直觉上来理解 set viewport = device-width
* 就是使文档平铺在设备屏幕上,并可统一使用css像素单位;消除了设备像素比率(devicePixelRatio)带来的影响
*/
var $viewport = document.getElementById('viewport'),
$window = document.getElementById('window'),
$screen = document.getElementById('screen');
var render = function () {
// the same as device-width
var s_w = window.screen.width;
// browser width
var w_w = window.innerWidth;
// viewport的功能是用来约束你网站中最顶级包含块元素(containing block)<html>的。
var v_w = document.documentElement.clientWidth;
// w_w == v_w + scrollbarWidth
$screen.innerHTML = s_w;
$window.innerHTML = w_w;
$viewport.innerHTML = v_w;
}
render();
window.onresize = render;
</script>
</body>
</html>