你如何从js客户端调用一个payable方法？

Question

假设您有一个 smart contract 方法，该方法需要将存款附加到方法调用上，类似于这样的 rust 方法：

#[payable]
pub fn spend(&mu self, age: u8){
    assert!(env::attached_deposit() > 0,
            "Insufficient deposit.");
.
.
.
}

现在您使用 near-api-js 设置您的合约并继续调用它。如何在客户端 js 中调用此方法并附加一些 Near？

Answer 1

您照常设置合同：

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 方法调用为：

await contract.transferCorgi({"receiver": "frol.near", "id": "corgi_xxx", "message": "hello"})

但是，当您想附加一些NEAR代币或增加gas津贴时，您需要指定optional positional arguments after the arguments:

await contract.changeMethodName(args: object, gas: BN, amount: BN)

备注：

BN是大数表示
默认 gas 限额为 300 Tgas [300 * 10^12 gas]，了解更多：FAQ on Gas in the documentation, NEP67
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)

你如何从js客户端调用一个payable方法？

How do you call a payable method from the js client?

javascript

rust

nearprotocol