问题来源
昨天早上某面试提出的一个问题,脑子一热漏写了一个条件,心塞。
问题大概是写一个两列布局,左边固定,高度都是默认填满页面,右边内容高度超出浏览器窗口出现滚动条。
解决办法
今天仔细想了下,用浮动做的话,高度不好弄成填满的。折腾了一会儿,搞出两种方案(不使用js的)。
- 左侧:fixed,右侧:absolute,min-height:100%,width为calc(100% - [左侧的width]),同时margin-left也为左侧的width
- html的overflow-x设置为hidden,右侧就可以不用calc了,直接width: 100%,不过这样的话,右侧元素使用margin 0 auto居中就会向右边偏移,偏移的长度为左侧的width
测试代码:
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| <!doctype html> <html> <head> <meta charset="utf-8"> <title>test layout</title> <style type="text/css"> *{ padding: 0; margin: 0; } /*html{ overflow-x:hidden; }*/ .left{ position: fixed; top: 0; left: 0; width: 100px; height: 100%; background-color: red; } .right{ position: absolute; width: calc(100% - 100px); min-height: 100%; margin-left: 100px; background-color: blue; } .center{ width: 100px; background-color: yellow; margin: 0 auto; } </style> <script> window.onload = function(){ var addBtn = document.getElementsByClassName('js-add-btn')[0]; var delBtn = document.getElementsByClassName('js-del-btn')[0]; var right = document.getElementsByClassName('right')[0]; addBtn.onclick = function(e){ var pNode = document.createElement('p'); pNode.innerText = 'content'; for(var i = 0; i < 20; i++){ var cpNode = pNode.cloneNode(true); right.appendChild(cpNode); } } delBtn.onclick = function(e){ var children = right.children; var len = children.length; var delCount = len > 20 ? 20 : len; for(var i = 0; i < delCount; i++){ right.removeChild(children[len - (i + 1)]); } } } </script> </head> <body> <div class="left"> <p>left</p> <button class="js-add-btn">增加右侧内容</button> <button class="js-del-btn">删除右侧内容</button> </div> <div class="right"> <div class="center"> <p>centered content</p> </div> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> <p>lots of content</p> </div> </body> </html>
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jsfiddle: https://jsfiddle.net/g9j8mcf4/1/