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t301000/file1.js

Created July 16, 2017 01:27
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file1.js
(function(){
var a;
a = b = 3;
})();
/*
a => 為 function 的區域變數，IIFE 執行完回收，ReferenceError: a is not define
b => 未用 var 宣告，所以會在 window 添加 b 屬性，其值為 3，IIFE 執行完依然存在
*/
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