jQuery中focusin()和focus()、find()和children()的差別
阿新 • • 發佈:2017-06-24
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jQuery中focus()和focusin()、focus()和children()的差別
focus()和focusin()
focus()和focusin()的差別在於focusin()支持事件的冒泡。以下舉例說明:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>focusin demo</title>
<style>
span {
display: none;
}
</style>
<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
<p><input type="text"> <span>focusin fire</span></p>
<p><input type="password"> <span>focusin fire</span></p>
<script>
$( "p" ).focusin(function() {
$( this ).find( "span" ).css( "display", "inline" ).fadeOut( 1000 );
});
</script>
</body>
</html>
當我們點擊輸入框時。其獲得焦點。導致獲得焦點事件向上冒泡,使得p標簽觸發獲得焦點事件,而focus()並不支持事件冒泡,相同地。focusout()支持事件冒泡,而blur()不支持。
find()和children()
find()和children()的差別在於find()向下追溯多級子節點,而children()僅僅向下追溯一級子節點。find()和children()相同的地方是他們在尋找子節點時都不包括自身節點。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
p{
font-size: 20px;
width: 200px;
color: blue;
font-weight: bold;
margin: 0 10px;
}
.hilite {
background: yellow;
}
#test{
font-weight: bolder;
}
</style>
</head>
<body>
<ul class="level-1">
<li class="item-i">I</li>
<li class="item-ii">II
<ul class="level-2">
<li class="item-a">A</li>
<li class="item-b">B
<ul class="level-3">
<li class="item-1">1</li>
<li class="item-2">2</li>
<li class="item-3">3</li>
</ul>
</li>
<li class="item-c">C</li>
</ul>
</li>
<li class="item-iii">III</li>
</ul>
<script src="jquery-2.1.4.js"></script>
<script>
$( "li.item-ii" ).find( "li" ).css( "background-color", "red" );
</script>
</body>
</html>
倘若將上例中的find()替換為children(),會得到不同的結果。
jQuery中focusin()和focus()、find()和children()的差別