jQuery * 选择器
定义和用法
* 选择器会选择文档中的所有元素，包括 html、head 和 body。
如果 * 选择器与其他元素一起使用，则会选择指定元素内的所有子元素。
提示：对于某些浏览器来说，* 选择器处理起来可能比较繁重。
语法
$("*")
亲自试一试 - 示例
选择 <body> 内的所有元素
使用 * 选择器选择 <body> 元素内的所有元素。
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