所以，我正在开发一个<canvas> 游戏，它是在引导模式中创建和呈现的。我正在尝试编写一个将在 gameOver 上调用的 javascript 函数，它将在我的画布顶部呈现一个新的（堆叠的）模式，并带有 3 个用于提交/注册/重播的按钮。
我在我的 html 中通过 data-toggle 呈现我的第一个模态并且工作正常，但是当我尝试在顶部呈现我的第二个模态（通过 javascript）时，它似乎被报告为未定义。
这是我的代码：JSFiddle。
（在这种情况下，我以我的画布绘制方法中的第二个模式为例，但我也尝试了一个单独的按钮、其他事件侦听器等。问题总是一样的）。
如果有更好的方法来显示带有按钮的 Game Over 屏幕，我愿意接受建议。我想避免在我的画布上绘制任何按钮并获得坐标来读取它的点击。
提前致谢。
【问题讨论】：
标签： javascript html twitter-bootstrap modal-dialog
如果你想在另一个模态之上打开模态，你必须调整z-index。使用此处Multiple modals overlay 提供的解决方案，您可以执行类似的操作。
$(document).ready(function() {
let canvas = null;
let drawCanvas = () => {
canvas = document.getElementById("myCanvas");
const context = canvas.getContext("2d");
context.fillStyle = "#FF0000";
context.fillRect(0, 0, 630, 850);
};
$('#openBtn').click(function() {
$('#myModal').modal({
show: true
});
if (!canvas) {
drawCanvas();
}
setTimeout(function() {
$('#myModal2').modal({
show: true,
});
}, 2000)
});
$(document).on('show.bs.modal', '.modal', function(event) {
var zIndex = 1040 + (10 * $('.modal:visible').length);
$(this).css('z-index', zIndex);
setTimeout(function() {
$('.modal-backdrop').not('.modal-stack').css('z-index', zIndex - 1).addClass('modal-stack');
}, 0);
});
});<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<body>
<h2>Stacked Bootstrap Modal Example.</h2>
<a id="openBtn" class="btn btn-primary">Launch modal</a>
<div class="modal fade" id="myModal">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">Modal 1</h4>
</div>
<div class="modal-body">
<canvas id="myCanvas" width="630" height="850">
</canvas>
<a data-toggle="modal" href="#myModal2" class="btn btn-primary">Launch modal</a>
</div>
<div class="modal-footer"> <a href="#" data-dismiss="modal" class="btn">Close</a>
<a href="#" class="btn btn-primary">Save changes</a>
</div>
</div>
</div>
</div>
<div class="modal fade rotate" id="myModal2">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">Modal 2</h4>
</div>
<div class="container"></div>
<div class="modal-body">Content for the dialog / modal goes here.
<br>
<br>
<p>come content</p>
<br>
<br>
<br> <a data-toggle="modal" href="#myModal3" class="btn btn-primary">Launch modal</a>
</div>
<div class="modal-footer"> <a href="#" data-dismiss="modal" class="btn">Close</a>
<a href="#" class="btn btn-primary">Save changes</a>
</div>
</div>
</div>
</div>
<div class="modal fade" id="myModal3">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">Modal 3</h4>
</div>
<div class="container"></div>
<div class="modal-body">Content for the dialog / modal goes here.
<br>
<br>
<br>
<br>
<br> <a data-toggle="modal" href="#myModal4" class="btn btn-primary">Launch modal</a>
</div>
<div class="modal-footer"> <a href="#" data-dismiss="modal" class="btn">Close</a>
<a href="#" class="btn btn-primary">Save changes</a>
</div>
</div>
</div>
</div>
<div class="modal fade" id="myModal4">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">Modal 4</h4>
</div>
<div class="container"></div>
<div class="modal-body">Content for the dialog / modal goes here.</div>
<div class="modal-footer"> <a href="#" data-dismiss="modal" class="btn">Close</a>
<a href="#" class="btn btn-primary">Save changes</a>
</div>
</div>
</div>
</div>
<script src="https://code.jquery.com/jquery.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</body>
</html>【讨论】：