var num = 10;

function process(num){
    num++;
}

process(num);

print(num);
//輸出結果為10


var person = new Object();
person.age=10;

process2(person);

print(person.age);

function process2(person){
    person.age++;
}
//輸出結果為11


var person3 = new Object();
person3.age =10;
process3(person3);
print(person3.age);


function process3(person){
    //person.age=20;
    person = new Object();
    person.age=100;

}
//輸出結果為10


var person4 = new Object();
person4.age =10;
person4=process4(person4);
print(person4.age);


function process4(person){
    person = new Object();
    person.age=100;
    return person;
}

//輸出結果為100



function print(msg){
    document.write(msg);
    document.write("<br>");
}