什么是数组 在JavaScript开发中，数组主要用于临时存储同类数据，进行高速批量运算。 例如，有一批用户名称需要临时进行记录保存，根据之前学习的知识，如果使用一个变量保存一个用户名称，就需要多个变量，这给代码编写和维护都带来了很大的困难，使用数组类型的变量来保存这种批量数据就 ...

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The figure represents a roughly 50,000-person increase since the Homeland Security secretary gave an update in July.

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