我在网上找到了这个教程，以帮助我通过以下链接了解 Jquery 的拖放功能与这个卡片映射小游戏...... http://www.elated.com/res/File/articles/development/javascript/jquery /drag-and-drop-with-jquery-your-essential-guide/card-game.html
在第 37 行，为什么 $('<div>' + numbers[i] + '</div>')在它还不存在的时候被选中，就我而言，当它们已经存在于文档中时，你在 Jquery 中选择它们.. 我不太明白那个选择器，有人可以请详细说明该选择器发生了什么？即使在第 48 行 ... 是uiJquery 中的内置词 .. 当他们说ui.draggable？究竟ui指的是什么？
谢谢 ！
<!doctype html>
<html lang="en">
<head>
<title>A jQuery Drag-and-Drop Number Cards Game</title>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<link rel="stylesheet" type="text/css" href="style.css">
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.5.0/jquery.min.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.9/jquery-ui.min.js"></script>
<script type="text/javascript">
var correctCards = 0;
$( init );
function init() {
// Hide the success message
$('#successMessage').hide();
$('#successMessage').css( {
left: '580px',
top: '250px',
width: 0,
height: 0
} );
// Reset the game
correctCards = 0;
$('#cardPile').html( '' );
$('#cardSlots').html( '' );
// Create the pile of shuffled cards
var numbers = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ];
numbers.sort( function() { return Math.random() - .5 } );
for ( var i=0; i<10; i++ ) {
$('<div>' + numbers[i] + '</div>').data( 'number', numbers[i] ).attr( 'id', 'card'+numbers[i] ).appendTo( '#cardPile' ).draggable( {
containment: '#content',
stack: '#cardPile div',
cursor: 'move',
revert: true
} );
}
// Create the card slots
var words = [ 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine', 'ten' ];
for ( var i=1; i<=10; i++ ) {
$('<div>' + words[i-1] + '</div>').data( 'number', i ).appendTo( '#cardSlots' ).droppable( {
accept: '#cardPile div',
hoverClass: 'hovered',
drop: handleCardDrop
} );
}
}
function handleCardDrop( event, ui ) {
var slotNumber = $(this).data( 'number' );
var cardNumber = ui.draggable.data( 'number' );
// If the card was dropped to the correct slot,
// change the card colour, position it directly
// on top of the slot, and prevent it being dragged
// again
if ( slotNumber == cardNumber ) {
ui.draggable.addClass( 'correct' );
ui.draggable.draggable( 'disable' );
$(this).droppable( 'disable' );
ui.draggable.position( { of: $(this), my: 'left top', at: 'left top' } );
ui.draggable.draggable( 'option', 'revert', false );
correctCards++;
}
// If all the cards have been placed correctly then display a message
// and reset the cards for another go
if ( correctCards == 10 ) {
$('#successMessage').show();
$('#successMessage').animate( {
left: '380px',
top: '200px',
width: '400px',
height: '100px',
opacity: 1
} );
}
}
</script>
</head>
<body>
<div class="wideBox">
<h1>Drag-and-Drop with jQuery: Your Essential Guide</h1>
<h2>A Number Cards Game</h2>
</div>
<div id="content">
<div id="cardPile"> </div>
<div id="cardSlots"> </div>
<div id="successMessage">
<h2>You did it!</h2>
<button onclick="init()">Play Again</button>
</div>
</div>
<div class="wideBox">
<p>© Elated.com | <a href="http://www.elated.com/articles/drag-and-drop-with-jquery-your-essential-guide/">Back to Tutorial</a></p>
<p style="font-size: .8em; line-height: 1.5em;"><a rel="license" href="http://creativecommons.org/licenses/by/3.0/"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by/3.0/88x31.png" /></a><br />This <span xmlns:dc="http://purl.org/dc/elements/1.1/" href="http://purl.org/dc/dcmitype/Text" rel="dc:type">work</span> by <a xmlns:cc="http://creativecommons.org/ns#" href="http://www.elated.com/" property="cc:attributionName" rel="cc:attributionURL">http://www.elated.com/</a> is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by/3.0/">Creative Commons Attribution 3.0 Unported License</a>.</p>
</div>
</body>
</html>