若不为空则先计算key的hash值，然后根据hash值搜索在table数组中的索引位置，如果table数组在该位置处有元素，则通过比较是否存在相同的key，若存在则覆盖原来key的value，==否则将该元素保存在链头（最先保存的元素放在链尾）==。

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