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用require(msg.sender == tx.origin)限制合约调用者 不能为合约
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用require(msg.sender == tx.origin)限制合约调用者 不能为合约
用require(msg.sender == tx.origin)限制合约调用者 不能为合约
如果用代理合约的话，那msg.sender不就等于tx.origin了吗
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