先给添加按钮添加一个id，创建一个点击事件方法，使用layer.open()方法中的iframe来显示弹窗
js代码
iframe页面代码：
<title>表单</title>
<link rel="stylesheet" href="${pageContext.request.contextPath}/layui/css/layui.css"/>
<script src="${pageContext.request.contextPath}/layui/layui.js"></script>
<script src="${pageContext.request.contextPath}/js/jquery-3.1.1.js"></script>
<style>
.layui-form-label {
width: 100px;
}
.layui-input-block {
margin-left: 130px;
min-height: 36px
}
</style>
</head>
<body class="body">
<form class="layui-form layui-from-pane" action="${pageContext.request.contextPath}/insetAdmin" style="margin-top:20px"
method="post">
<div class="layui-form-item">
<label class="layui-form-label">用户名：</label>
<div class="layui-input-block">
<input type="text" name="username" required lay-verify="required" autocomplete="off" placeholder="请输入用户名"
class="layui-input">
</div>
</div>
<div class="layui-form-item">
<label class="layui-form-label">密码：</label>
<div class="layui-input-block">
<input type="text" name="password" required lay-verify="required" autocomplete="off" placeholder="请输入密码"
class="layui-input">
</div>
</div>
<div class="layui-form-item">
<label class="layui-form-label">类别：</label>
<div class="layui-input-block">
<input type="text" name="type" required lay-verify="required" autocomplete="off" placeholder="请输入类别"
class="layui-input">
</div>
</div>
<div class="layui-form-item" style="margin-top:40px">
<div class="layui-input-block">
<button class="layui-btn layui-btn-submit " lay-submit="" lay-filter="demo1" id="tj">立即提交</button>
<button type="reset" class="layui-btn layui-btn-primary">重置</button>
</div>
</div>
</form>
<script>
$('#tj').click(function(){
setTimeout(function(){//设置定时器
parent.location.reload(true);//刷新父级页面
layer.msg("成功")
var index = parent.layer.getFrameIndex(window.name);
parent.layer.close(index);
},0);
})
</script>
</body>
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