<!DOCTYPE html>
<html>
<head>
<title>Bootstrap 实例</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
<script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script>
<script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container mt-3">
<h1>输入框添加按钮组</h1>
<div class="input-group mb-3">
<div class="input-group-prepend">
<button class="btn btn-outline-secondary" type="button">Basic Button</button>
</div>
<input type="text" class="form-control" placeholder="Some text">
</div>
<div class="input-group mb-3">
<input type="text" class="form-control" placeholder="Search">
<div class="input-group-append">
<button class="btn btn-success" type="submit">Go</button>
</div>
</div>
<div class="input-group mb-3">
<input type="text" class="form-control" placeholder="Something clever..">
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