JSON：巢狀範例

//第一個JSON
var person2 = {
 id : 1234,
 name : "joyce "
};

//第二個JSON
var person = {
 firstName: "John",
 lastName : "Doe",
 id : person2 ,     //取得第一個JSON
 getId : function() { return this.id },
 fullName : function(){return this.firstName + " " + this.lastName}
};

//透過第二個JSON取得第一個JSON的某個value
document.getElementById("demo").innerHTML = person.id.id ;