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Prevent pollution

Prevent window pollution by create a new variable named window.

此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.org/scripts/17562/110734/Prevent%20pollution.js 

var _win = window;
eval('var window = {};');