后代选择器用双斜线 // 表示。
但是,方括号中谓词前的单斜线或双斜线(/ 或 //)没有上下文,所以引用到文档的根。
However, a slash or a double slash ( / or // ) at the front of a predicate in square brackets does not have a context and therefore refers to the root of the document.
但是,方括号中谓词前的单斜线或双斜线(/ 或 //)没有上下文,所以引用到文档的根。
However, a slash or a double slash ( / or // ) at the front of a predicate in square brackets does not have a context and therefore refers to the root of the document.
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