不出现滚动条，图片自动缩放为屏幕_html/css_WEB-ITnose
回复讨论(解决方案)
style="width:100%"就是自动适应宽度，需要注意图片外面是否还有其他对象，如果有，一般采用js计算
有几种解决办法，分别适合不同的场景。
1. 背景图片。
background-image:url();background-size:100% 100%;
这种缺点是不兼容低版本ie浏览器。
2. 绝对定位，js计算宽高。
#a{position:absolute:top:0;left:0};
function getSize() { var winWidth = 0, winHeight = 0; if (window.innerWidth) winWidth = window.innerWidth; else if ((document.body) && (document.body.clientWidth)) winWidth = document.body.clientWidth; // 获取窗口高度 if (window.innerHeight) winHeight = window.innerHeight; else if ((document.body) && (document.body.clientHeight)) winHeight = document.body.clientHeight; if (document.documentElement && document.documentElement.clientHeight && document.documentElement.clientWidth) { winHeight = document.documentElement.clientHeight; winWidth = document.documentElement.clientWidth; } return { w : winWidth, h : winHeight };}var size = getSize();document.getElementById('a').width = size.w + 'px'; document.getElementById('a').heigth = size.h + 'px'; img{width:100%}
个人一般用：max-width:100%，这个样式。这个好处在于如果图片小于屏幕宽度时，不会被放大模糊，如果超出屏幕时，会自动调整为屏幕大小且不会变形。
代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>无标题文档</title><style type="text/css">body,html{ margin:0px; height:100%;}</style></head><body> <div class="autoHeight"><img src="/static/imghw/default1.png" data-src="5398780_094651038992_2.jpg" class="lazy" style="max-width:90%" / alt="不出现滚动条，图片自动缩放为屏幕_html/css_WEB-ITnose" ></div></body></html> 我建议的方法：
如果图片只作图片处理：写css声明，将该图片的宽设auto, 高的设定，通过写段js事件在页面加载时，实现读取浏览器的窗口的高度附值到该img，那么你打开页面时，就绝对没有上下滚动条，但不排除左右有空白。
如果图片作为背景处理：写css声明一div，width:100%,overflow:hidden;通过写段js事件在页面加载时，实现读取浏览器的窗口的高度附值到该div，那么你打开页面时，就绝对没有上下左右滚动条。
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