物件傳遞問題

[tirme (Tirme)]

var main = {
        data : {},
        setData : function() {
                setObj(this.data)
                alert(this.data.id);
        }
};

function setObj(obj) {
        var newData = {};
        newData.id = "123";
        obj = newData;  // obj = main.data
}

The main.setData() alert is undefined.

Change setObj function :
function setObj(obj) {
        var newData = {};
        newData.id = "123";
        obj.prop = newData;
}

The main.setData() alert(this.data.prop.id) is "123".

How to modify original setObj function
and main.setData() alert(this.data.id) is "123"?

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