web3js获取区块链钱包地址指定代币余额

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var account = ethereum.selectedAddress
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// 获取余额
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ethereum.request({
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      method: 'eth_getBalance',
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      params: [
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        account ,
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        'latest'
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      ]
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  })
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  .then((result) => {
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      console.log("获取余额success--->" + result)
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      let formatEther = ethers.utils.formatEther(result); //16进制的wei
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      console.log(formatEther)
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  })
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  .catch((error) => {
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      console.error(error)
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  });

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var account = ethereum.selectedAddress
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const USDTContractAddress = "..."; // USDT合约地址
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const USDTContractABI = [...]; // USDT合约ABI
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// 创建一个web3实例，连接到metamask提供的provider
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const web3 = new Web3(window.ethereum);
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// 创建一个USDT合约实例
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const USDTContract = new web3.eth.Contract(USDTContractABI, USDTContractAddress);
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USDTContract.methods.balanceOf(account).call((error, result) => {
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  if (error) {
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    console.error(error)
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  } else {
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    console.log(result);
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    let formatEther = ethers.utils.formatEther(result); //16进制的wei
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    console.log(formatEther)
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  }
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});