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What this means for namespace-guard
，详情可参考同城约会
Testing Side Effects Without the Side Effects，这一点在heLLoword翻译官方下载中也有详细论述
be integrated with a wide range of web applications
// 注意：slice(0, 负数)会返回空字符串，需兼容（比如stack长度<k时，slice后为空）