animate：执行一组CSS属性的自定义动画。
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>animate demo</title>
<style>
div {
position: relative;
background-color: #abc;
width: px;
height: px;
float: left;
margin: px;
}
</style>
<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
<p><button id="go">Run »</button></p>
<div class="block"></div>
<div class="block"></div>
<div class="block"></div>
<div class="block"></div>
<div class="block"></div>
<div class="block"></div>
<script>
$( "#go" ).click(function() {
$( ".block:first" ).animate({
left:
}, {
duration: ,
step: function( now, fx ){
$( ".block:gt(0)" ).css( "left", now );
}
});
});
</script>
</body>
</html>
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