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默认第一次进入的时候游标在-1的位置，读取的时候从0开始读取，但如果进入下一个界面返回此时游标在0，会从1开始读，导致第一个读取不到
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默认第一次进入的时候游标在-1的位置，读取的时候从0开始读取，但如果进入下一个界面返回此时游标在0，会从1开始读，导致第一个读取不到