javascript - 如何通过 JavaScript 在 Metamask 上批准金额并稍后通过代码逻辑发送资金

Question

我正在编写一个 Web 应用程序（使用 javaScript ethers.js）来与 Metamask 交互。如果我想发送交易，我会这样做：

const provider = new ethers.providers.Web3Provider(window.ethereum)
const signer = provider.getSigner()

// here Metamask will ask to confirm tracsaction
const tx = await signer.sendTransaction({
  to: "0x.....",
  value: someAmount
});

但是，如果我希望 Metamask 只批准交易并且程序可以执行一些逻辑并在逻辑完成后进行交易，我该怎么办？像这样的东西：

const provider = new ethers.providers.Web3Provider(window.ethereum)
const signer = provider.getSigner()
        
// here Matamask ask to approve the amount
//......

// await for some logic here...

// Could Metamask here NOT ask to confirm transaction anymore (?)
const tx = await signer.sendTransaction({
  to: "0x.....",
  value: someAmount
});