自定义交易
在某些情况下，您可能需要构建涉及多种程序类型和资产的交易；这可以通过实例化一个 ScriptTransactionRequest 来实现。这个类允许您将多个程序类型和资产附加到单个交易中。
考虑以下脚本，它将多个资产转移到一个合约中：
script;
use std::asset::transfer;
fn main(
contract_address: b256,
asset_a: AssetId,
amount_asset_a: u64,
asset_b: AssetId,
amount_asset_b: u64,
) -> bool {
let wrapped_contract = ContractId::from(contract_address);
let contract_id = Identity::ContractId(wrapped_contract);
transfer(contract_id, asset_a, amount_asset_a);
transfer(contract_id, asset_b, amount_asset_b);
true
} 可以通过创建一个 ScriptTransactionRequest ，附加资源和合约输入/输出，然后发送交易来执行这个脚本，如下所示：
// #import { BN, ScriptTransactionRequest };
// 1. Create a script transaction using the script binary
const request = new ScriptTransactionRequest({
...defaultTxParams,
gasLimit: 3_000_000,
script: scriptBin,
});
// 2. Instantiate the script main arguments
const scriptArguments = [
contract.id.toB256(),
{ bits: ASSET_A },
new BN(1000),
{ bits: ASSET_B },
new BN(500),
];
// 3. Populate the script data and add the contract input and output
request.setData(abiContents, scriptArguments).addContractInputAndOutput(contract.id);
// 4. Get the transaction resources
const quantities = [coinQuantityfy([1000, ASSET_A]), coinQuantityfy([500, ASSET_B])];
// 5. Calculate the transaction fee
const txCost = await provider.getTransactionCost(request, { quantitiesToContract: quantities });
request.gasLimit = txCost.gasUsed;
request.maxFee = txCost.maxFee;
await wallet.fund(request, txCost);
// 6. Send the transaction
const tx = await wallet.sendTransaction(request);
await tx.waitForResult();