javascript 事件监听器和事件对象
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.100.2/css/materialize.min.css">
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" integrity="sha384-wvfXpqpZZVQGK6TAh5PVlGOfQNHSoD2xbE+QkPxCAFlNEevoEH3Sl0sibVcOQVnN"
crossorigin="anonymous">
<title>Task List</title>
</head>
<body>
<div class="container">
<div class="row">
<div class="col s12">
<div id="main" class="card">
<div class="card-content">
<span class="card-title">Task List</span>
<div class="row">
<form id="task-form">
<div class="input-field col s12">
<input type="text" name="task" id="task" value="Walk the dog">
<label for="task">New Task</label>
</div>
</div>
<input type="submit" value="Add Task" class="btn">
</form>
</div>
<div class="card-action">
<h5 id="task-title">Tasks</h5>
<ul class="collection">
<li class="collection-item">
List Item
<a href="#" class="delete-item secondary-content">
<i class="fa fa-remove"></i>
</a>
</li>
<li class="collection-item">
List Item
<a href="#" class="delete-item secondary-content">
<i class="fa fa-remove"></i>
</a>
</li>
<li class="collection-item">
List Item
<a href="#" class="delete-item secondary-content">
<i class="fa fa-remove"></i>
</a>
</li>
<li class="collection-item">
List Item
<a href="#" class="delete-item secondary-content">
<i class="fa fa-remove"></i>
</a>
</li>
<li class="collection-item">
List Item
<a href="#" class="delete-item secondary-content">
<i class="fa fa-remove"></i>
</a>
</li>
</ul>
<a class="clear-tasks btn black" href="">Clear Tasks</a>
</div>
</div>
</div>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.2.1.js" integrity="sha256-DZAnKJ/6XZ9si04Hgrsxu/8s717jcIzLy3oi35EouyE=" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.100.2/js/materialize.min.js"></script>
<script src="app.js"></script>
</body>
</html>// document.querySelector('.clear-tasks').addEventListener('click', function(e){
// console.log('Hello World');
// //e.preventDefault();
// });
document.querySelector('.clear-tasks').addEventListener('click', onClick);
function onClick(e){
//console.log('Clicked');
let val;
val = e;
// Event target element
val = e.target;
val = e.target.id;
val = e.target.className;
val = e.target.classList;
// Event type
val = e.type;
// Timestamp
val = e.timeStamp;
// Coords event relative to the window
val = e.clientY;
val = e.clientX;
// Coords event relative to the element
val = e.offsetY;
val = e.offsetX;
console.log(val);
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