functionshowJSON(){varuser={"username":"andy","age":20,"info":{"tel":"123456","cellphone":"98765"},"address":[{"city":"beijing","postcode":"222333"},{"city":"newyork","postcode":"555666"}]}alert(user.username);alert(user.age);alert(user.info.cellphone);alert(user.address[0].city);alert(user.address[0].postcode);}如何在頁面顯示alert(user.username);alert(user.age);alert(user.info.cellphone);alert(user.address[0].city);alert(user.address[0].postcode);這些要顯示的屬性在body里面要怎么寫？