How can i use ExtendedScript to Replace Footage in premiere pro cc?

there are several footages in my premiere project,

i want to replace them with the new footages,

in the software, i can select the footage layer,

then right click Replace Footage to do it,

but how can i do it use ExtendedScript?

i found a method, called [projectItem].changeMediaPath(),

but it didn't work, is there any other codes can do that?

thanks for your answer.