你如何从js客户端调用一个payable方法？

Question

想象一下，您有一个smart contract方法，该方法需要将存款附加到方法调用上，类似于此rust方法：

#[payable]

pub fn spend(&mu self, age: u8){

    assert!(env::attached_deposit() > 0,

            "Insufficient deposit.");

.

.

.

}

现在你使用设置你的合同near-api-js并继续调用它。如何调用此方法并Near在客户端 js 中附加一些方法？

Answer 1

您像往常一样设置合同：const contract = await new nearlib.Contract(    walletConnection.account(),    nearConfig.contractName,    {      // View methods are read only. They don't modify the state, but usually return some value.      viewMethods: ["getCorgi", "getCorgisList", "displayGolbalCorgis"],      // Change methods can modify the state. But you don't receive the returned value when called.      changeMethods: ["transferCorgi", "createCorgi", "deleteCorgi"],      // Sender is the account ID to initialize transactions.      sender: walletConnection.getAccountId(),    }  );通常，您将 change 方法称为：await contract.transferCorgi({"receiver": "frol.near", "id": "corgi_xxx", "message": "hello"})然而，当你想附加一些 NEAR 代币或增加 gas 津贴时，你需要在参数后指定可选的位置参数：await contract.changeMethodName(args: object, gas: BN, amount: BN)笔记：BN是大数表示默认的 gas 限额是 300 Tgas [300 * 10^12 gas]数量在 yoctoNEAR 中指定（1 NEAR 是 10^24 yoctoNEAR）例如：const ONE_NEAR = new BN("1000000000000000000000000")await contract.createCorgi({"id": "corgi_xxx"}, new BN("3000000000000"), ONE_NEAR)