版权声明：哼！坏人！这是我辛辛苦苦码的！ https://blog.csdn.net/DurianPudding/article/details/87917090
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>输入框的布局</title>
<style>
.InputAddOn {
display: flex;
width: 50%;
}
.InputAddOn-field {
flex: 1;
}
</style>
</head>
<body>
<h2>输入框的布局</h2>
<pre>参考：<a href="http://www.ruanyifeng.com/blog/2015/07/flex-examples.html" target="_blank">Flex布局</a></pre>
<p>将输入框弹性</p>
<div class="InputAddOn">
<span class="InputAddOn-item">账号</span>
<input class="InputAddOn-field">
<button class="InputAddOn-item">发送</button>
</div>
</body>
</html>