即将显示工具提示时，会引发Bootstrap中的show.bs.tooltip事件-
$("[data-toggle='tooltip']").on('show.bs.tooltip', function(){
alert('Tooltip will be visible now.');
});之前，“数据切换”属性设置为<a>标记属性，因为Bootstrap本身会从那里生成-
<a href="#" data-toggle="tooltip" title="1PM-4PM!"> Timings </a>
您可以尝试运行以下代码来实现show.bs.tooltip事件-
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h3>Event</h3>
<p>Here tooltip will be displayed using the "Show" buttpn and can be hidden using the "Hide" button.</p>
<a href="#" data-toggle="tooltip" title="1PM-4PM!">Timings</a>
<div>
<button type="button" class="btn btn-primary">Show</button>
<button type="button" class="btn btn-default">Hide</button>
</div>
</div>
<script>
$(document).ready(function(){
$(".btn-primary").click(function(){
$("[data-toggle='tooltip']").tooltip('show');
});
$(".btn-default").click(function(){
$("[data-toggle='tooltip']").tooltip('hide');
});
$("[data-toggle='tooltip']").on('show.bs.tooltip', function(){
alert('Tooltip will be visible now.');
});
$("[data-toggle='tooltip']").on('shown.bs.tooltip', function(){
alert('Tooltip is completely visible now.');
});
$("[data-toggle='tooltip']").on('hide.bs.tooltip', function(){
alert('Tooltip will hide now.');
});
$("[data-toggle='tooltip']").on('hidden.bs.tooltip', function(){
alert('Tooltip is completely hidden now.');
});
});
</script>
</body>
</html>