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In page reconstruction, we often need to implement multi-column layout, such as a combination of n columns with fixed width and m columns with adaptive width, absolute layout padding and percentage width are easy to think of more violent solutions. method, but as future "engineers", we should need some more elegant methods. Let’s talk about the two-column layout first. The example above:

<div class='container' >    <div class='div1' >1</div>    <div class='div2' >2</div></div>

As shown in the figure, if there are two child elements in a container, we want the width of the element to be 1 It is 200px, and the width of element 2 fills the remaining container width. The more violent method is the absolute layout padding percentage width mentioned earlier. The key css:

//暴力方法 绝对布局 + padding + 百分比.container{padding-left: 200px;position: relative;}.div1{height: 200px;position: absolute;left: 0;}.div2{width: 100%;}

I am an example. Poke me

Of course, .div2 here is a block-level element, and it is okay to have no width.

The second method is to use the mysterious "BFC" under specific conditions of the dom element to specifically clear the float. If you don't understand, search it and go directly. Key css

//优雅方法 float + BFC.div1{width:200px;float: left;}.div2{overflow: hidden;}

I am an example, poke me

, isn’t it much more elegant? Because under the condition that the specific width of .div1 is known, the BFC feature of .div2 can not be triggered. Setting its margin-left:200px can also achieve the same page effect. However, if .div1 changes, it needs to be changed manually. The margin-left of .div2 is changed, which is not flexible enough. If you are interested, you can try it yourself.

The third method is to use the flex layout of css3, which is the legendary new generation layout-flowing layout. Let’s not talk about the principle, but the key point is css

//前卫方法 flex.container{display: flex;}.div1{width:200px;}.div2{flex:1;}

I am an example, poke me

is it also very simple? If you want to know more principles, I still recommend it Take a look at the master's blog. This is just a place to summarize knowledge 0.0, and the flex layout may require a prefix in some browsers. You can go to http://pleeease.io/play/ to automatically add the browser prefix (a good bookmark)

The fourth method, which was once popular in the front-end circles in "ancient times", is the table layout, using css

//远古方法 table + table-cell.container{display:table;width: 100%;}.div1{width:200px;display: table-cell;}.div2{display:table-cell;}

I am an example, poke me

It actually looks quite simple, haha. . But maybe it was replaced by other layout methods because the name is not fancy enough or for other reasons

The examples mentioned above are all for two-column layout. If If there are more than two columns, the float BFC method is not easy to use, because only one column can be adaptively filled with the remaining width by clearing the float. Personally, I recommend using flex layout. The principle is the same, fixed width. Just set the width, and adaptively set the flex value according to the ratio. The table layout is not flexible enough. For table-cell with a fixed width, the width is set. If the width is not set, the remaining width will be equally divided.

To summarize the above, flex is the most flexible. In fact, there are many advantages of flex. For example, it can realize vertical and horizontal centering of

elements

.container{ display:flex;            align-items: center;//子元素垂直居中            justify-content: center;//子元素水平居中      }                

Of course, align-items and justify-content have different writing methods in old browsers, but most modern browsers support this writing method. To be conservative, when using Go to http://pleeease.io/play/ and http://caniuse.com/ to check it out

Vertical multi-column adaptive layout, etc.

.container{display: flex;flex-direction: column;height: 500px;}.div1{width: 100%; flex:1;}.div2{width: 100%;height: 200px;}.div3{width: 100%;flex:1;}

Just learn other more magical uses slowly. Please point out if there are any errors

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