If the resolved context variable content is null, no replacement occurs and the variable name remains unchanged in the query string (including the "%" signs).

如果解析后的上下文变量内容为空，则不会发生替换，并且变量名称在查询字符串中保持不变(包括“%”符号)。

youdao

If the resolved context variable content is null, no replacement occurs and the variable name remains unchanged in the query string (including the "%" signs).

如果解析后的上下文变量内容为空，则不会发生替换，并且变量名称在查询字符串中保持不变(包括“%”符号)。

youdao