javascript - 如何修复 JavaScript/Solidity 中的“Uncaught (in promise) TypeError”

Question

我正在尝试从合同中访问一些值以显示在前端。我通过调用一些 getter 方法来做到这一点，这三个方法中只有两个有效，第三个方法是在控制台中得到这个“Uncaught (in promise) TypeError: Cannot read property 'tronWeb' of undefined”。

这是 Javascript/React

await Utils.setTronWeb(window.tronWeb, contractAddress);
...
// this one works
async getTron2Balance()
{
  const bal = (await Utils.contract.getMyTron2().call()).toNumber();
  console.log("Tron² Balance:", bal);
  document.getElementById("tron2").innerHTML = bal;
  this.getMicroTronBalance();
}
// this one doesn't
async getMicroTronBalance()
{
  const bal = (await Utils.contract.getMyMicroTron().call()).toNumber();
  console.log("MicroTron Balance:", bal);
  document.getElementById("microTron").innerHTML = bal;
}

现在这是solidity代码

function getMyTron2() public
    view
    returns
    (uint256)
{
  return safeTron[msg.sender];
}

function getMyMicroTron() public
    view
    returns
    (uint256)
{
  updatePlayersMicroTron(msg.sender);
  tempOldTime = block.timestamp;
  return rewardedMicroTron[msg.sender];
}

我觉得这与block.timestamp有关，有人知道吗？