$( "html" ).parent() method returns a collection containing documents, while $( "html" ).parents() returns an empty collection. Can any expert explain it? -PHP Chinese website Q&A-The $( "html" ).parent() method returns a collection containing documents, while $( "html" ).parents() returns an empty collection. Can any expert explain it? -PHP Chinese website Q&A
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$( "html" ).parent() method returns a collection containing documents, while $( "html" ).parents() returns an empty collection. Can any expert explain it? -PHP Chinese website Q&A-The $( "html" ).parent() method returns a collection containing documents, while $( "html" ).parents() returns an empty collection. Can any expert explain it? -PHP Chinese website Q&A
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parents()是取得一个包含着所有匹配元素的祖先元素的元素集合（不包含根元素），而parent()是取得一个包含着所有匹配元素的唯一父元素的元素集合。当$的对象是根元素html时，parents()就是空集合，parent()就是文档集合