※ 引述《tirme (Tirme)》之銘言：
: 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"?
the first setObj is doing `pass by value`, not `pass by reference`.
js does not support passing by reference for types such as string,
number, or boolean.
however, it does automatically pass by reference objects, functions,
arrays, HTMLElements and other complex objects
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