jQuery contents() 方法
定义和用法
contents() 方法返回所选元素的所有直接子元素，包括文本和注释节点。
文本节点是元素显示的实际文本。
此方法类似于 children() 方法，不同之处在于它也返回文本和注释节点。如果 iframe 在同一域名下，contents() 方法也可以访问 iframe 的 HTML。
语法
$(选择器).contents()
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