HTML：

<form id="myForm">
	<div class="form-group">
		<label>Site Name</label>
		<input type="text" class="form-control" id="siteName" placeholder="Website Name">
	</div>
	<div class="form-group">
		<label>Site URL</label>
		<input type="text"
 
 class="form-control" id="siteUrl" placeholder="Website URL">
	</div>
	<button type="submit" class="btn btn-primary">Submit</button>
</form>

JS:

// 為表單新增監聽事件
document.getElementById('myForm').addEventListener('submit', saveBookmark);

function saveBookmark() {
	//...
}

這裡也就是刻意強調一下addEventListener

END.