※ 引述《HuangJC (吹笛牧童)》之銘言：
: t = new Array(); //這樣可以建立一個陣列
: t = Array(); //這樣一樣可以建立陣列,有差嗎?
"The new operator must be followed by a function invocation. It creates a new
object, with no properties and then invokes the function, passing the new
object as the value of the this keyword."
from: JavaScript: The Definitive Guide, 5th Edition, 9.1. Constructors
上面是對 new 的解釋。
不過我沒有在這本書看過 t = Array() 的看法，在我來看的話，我會看成是一個
function，並將 return value assign 給 t。
可以用 for ... in statement 測試，只要 a 的 attributes b 都有，
而且 b 的 attributes a 也都有，就可以當作都是“一樣”的 object 了。
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