


Holy Grail layout: two columns fixed - middle column floating - middle column div ranked first. The advantage is that when the network speed is slow, the content column can be displayed first
< ;div id="left" class="column">
An additional DIV contains our three layers. This structure conforms to my focus on integrating the content into one tag. The custom
style is very simple. The left sidebar is 200PX and the right side is 150. For simplicity, LC, RC and CC represent the left, right and middle respectively. The style is as follows:
body {
min-width: 550px; /* 2x LC width RC width */
}
#container {
padding-left: 200px; /* LC width */
padding-right: 150px; / * RC width */
}
#container .column {
position: relative;
float: left;
}
#center {
width: 100%;
}
#left {
width: 200px; /* LC width */
right: 200px; /* LC width */
margin-left: -100%;
}
#right {
width: 150px; /* RC width */
margin-right: -150px; /* RC width */
}
#footer {
clear: both;
}
/*** IE6 Fix ***/
* html #left {
left: 150px; /* RC width */
}
Principle
In fact, the trick is very simple. Let the left column and the padding on the left side of the wrap, and the right column and the right padding of the wrap. Just leave the adaptive content layer in the middle. The left occupies the padding-left of the wrap; the right occupies the padding of the wrap. padding-right

The official account web page update cache, this thing is simple and simple, and it is complicated enough to drink a pot of it. You worked hard to update the official account article, but the user still opened the old version. Who can bear the taste? In this article, let’s take a look at the twists and turns behind this and how to solve this problem gracefully. After reading it, you can easily deal with various caching problems, allowing your users to always experience the freshest content. Let’s talk about the basics first. To put it bluntly, in order to improve access speed, the browser or server stores some static resources (such as pictures, CSS, JS) or page content. Next time you access it, you can directly retrieve it from the cache without having to download it again, and it is naturally fast. But this thing is also a double-edged sword. The new version is online,

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