写一个小的demo,具体是点击添加按钮，会自动生成input输入框，并且根据要求限制生成的input输入框的个数。
大致效果如下所示：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
<style>
.form-group{
height: 26px;
}
.control-label{
margin-top:8px;
}
#fat-btn{
margin-left: 12px;
}
</style>
</head>
<body>
<div class="row">
<div class="col-md-12 col-sm-12 col-xs-12">
<div class="form-group">
<label class="col-sm-1 control-label">检测时间</label>
<div class="col-sm-4" style="width: 109px;">
<input type="text" value="09:00" class="form-control sleepStart" ></input>
</div>
<div class="col-sm-4" style="width: 109px;">
<input type="text" value="17:30" class="form-control sleepStop" ></input>
</div>
</div>
</div>
</div>
<div id="time"></div>
<div class="row">
<div class="col-md-12 col-sm-12 col-xs-12">
<div class="form-group">
<button id="fat-btn" class="btn btn-primary" type="button">添加
</button>
</div>
</div>
</div>
</body>
<script>
$(function() {
$("#fat-btn").click(function() {
if($('.sleepStart').length > 2) {
return alert('超过三个了')
} else {
var htm = "";
htm = "<div class='row'>";
htm = "<div class='col-md-12 col-sm-12 col-xs-12'>";
htm = "<div class='form-group'>";
htm = "<label class='col-sm-1 control-label'>检测时间</label>";
htm = "<div class='col-sm-4' style='width: 109px;'>";
htm = "<input type='text' value='09:00' class='form-control sleepStart'></input></div>";
htm = "<div class='col-sm-4' style='width: 109px;'>";
htm = "<input type= 'text' value='17:30' class='form-control sleepStop'></input>";
htm = "</div></div></div></div>";
$('#time').append(htm);
}
});
});
</script>
</html>原文作者：祈澈姑娘 技术博客：https://www.jianshu.com/u/05f416aefbe1 90后前端妹子，爱编程，爱运营，文艺与代码齐飞，魅力与智慧共存的程序媛一枚。
