为什么sendTransaction要消耗太多的汽油？

Question

我有一份合同

contract tokenEvents
{
    event globalEvent(address contractAddress, string eventName, uint value);
    event globalEvent2(address contractAddress, string eventName, uint value, address senderAddress);

    function callEvent(string eventName, uint value)
    {
        globalEvent(msg.sender, eventName, value);
    }

    function callEvent2(string eventName, uint value, address senderAddress)
    {
        globalEvent2(msg.sender, eventName, value, senderAddress);
    }

}

另一项合同用于上述合同，如

function(){
    uint amount = msg.value;
    amountRaised += amount;
    tokenEvents te = tokenEvents(0x5488845db957f6fd3691b0c2959b607dc52f09b2); 
    uint nValue;
    address senderAddress;

    if (msg.sender == partyone){
        if (contribution[partyone] == 0)
        {
            contribution[partyone] = amount;
        }
        else
        {
            contribution[partyone] += amount;
        }

        eventName = "party1_contribution";
        nValue = contribution[partyone];
        senderAddress = partyone;

    }
    else if (msg.sender != beneficiary) {
        partytwo = msg.sender;
        if (contribution[partytwo] == 0){
            contribution[partytwo] = amount;
        } else {
            contribution[partytwo] += amount;
        }

        eventName = "party2_contribution";
        nValue = contribution[partytwo];
        senderAddress = partytwo;
    } 
    else {
        if (contribution[msg.sender] == 0){
            contribution[msg.sender] = amount;
        } else {
            contribution[msg.sender] += amount;
        }

        eventName = "other_contribution";
        nValue = contribution[msg.sender];
        senderAddress = msg.sender;
    }

    te.callEvent2(eventName, nValue, senderAddress);
}

现在，每当我给乙醚一些乙醚到这个合同，它需要太多的气体。例如: 20000

有什么问题吗？

Answer 1

21000气体是标准、非合同交易所需的气体.你需要根据计算量来增加气体。

所有的气体都被退还了，所以最简单的方法是用100 K的气体进行交易，在以太扫描时去TX，看看它最终使用了多少气体。将来你可以使用这个数额。

(我怎么知道打电话给合同要用多少汽油？)