When should I consider using position to position an element instead of flex box?
P粉914731066
2023-07-23 17:48:48
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<pre class="brush:php;toolbar:false;"><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
#dn {
width: 400px;
height: 400px;
padding: 20px;
border: 2px solid #cd1313;
}
.box1 {
width: 100%;
height: 100%;
display: flex;
justify-content: center;
align-items: center;
text-align: center;
font-weight: bold;
color: white;
font-size: 24px;
background-color: #000000;
}
</style>
</head>
<body>
<div id="dn" class="boxn">
Lorem, ipsum dolor sit amet consectetur adipisicing elit. Architecto ducimus repudiandae inventore iste porro distinctio necessitatibus incidunt accusamus facilis obcaecati! hey namen
<div id="d1" class="box1">
Child
</div>
Lorem ipsum dolor sit amet consectetur adipisicing elit. Eaque deleniti quibusdam quod praesentium, soluta harum alias aperiam hic voluptatum natus?
</div>
</body>
</html></pre>
<p>我已经将box1显示为伸缩框。它不仅允许我水平对齐里面的项目(子)，还允许我沿着交叉轴垂直对齐项目。然后我问自己，为什么我没有使用位置来居中的文字?那么后果会是什么呢?是因为我们不能在文本上应用位置吗?，如果项目是一个跨度框，我可以在其中应用位置吗?如果是，那么它不会产生问题，因为我们必须使用绝对位置来使它响应boxn。这个问题又长又烦人，但对我来说很重要。</p>
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When using position, you must define how many pixels on each side of the object are needed to position it. This is not very flexible. Imagine you have to measure/calculate/try how many pixels each object needs for different screen sizes, it's possible but it takes a lot of time and effort. So flexbox is easier to implement.
With flexbox, your content will be more consistent. I mean, it calculates for you how many pixels you need on each side of the object. This will reduce the chance of off-target calculations. Therefore, all elements will be positioned the same way.