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jQuery Selector - 如何查找“上下文”(document.body)中的所有元素

我們想知道如何查找“上下文”(document.body)中的所有元素。
<html>
<head>
<script type="text/javascript" src='http://code.jquery.com/jquery-1.5.2.js'></script>
<script type="text/javascript">
$(document).ready(function(){
$("*", document.body).css("border","3px solid red");
});
</script>
</head>
<body>
<div>A div</div>
<button>0</button>
<button>1</button>
<button>2</button>
<button>3</button>
<span></span>
</body>
</html>
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