sWhere Required. String that specifies where the text is located using one of the following values: beforeBegin Text is returned immediately before the element.
afterBegin Text is returned after the start of the element but before all other content in the element.
beforeEnd Text is returned immediately before the end of the element but after all other content in the element.
afterEnd Text is returned immediately after the end of the element.
MSDN的,看来似乎就这几个
sWhere Required. String that specifies where the text is located using one of the following values:
beforeBegin Text is returned immediately before the element.
afterBegin Text is returned after the start of the element but before all other content in the element.
beforeEnd Text is returned immediately before the end of the element but after all other content in the element.
afterEnd Text is returned immediately after the end of the element.