function siblings(){ var siblings =["John", "Liza", "Peter"]; function siblingCount(){ var siblingsLength = siblings.length; return siblingsLength; } function joinSiblingNames(){ return "I have " + siblingCount() + " siblings:\n\n" + siblings.join("\n"); } return joinSiblingNames(); } alert(siblings()); //輸出 "I have 3 siblings: John Liza Peter"