Javascript 从按钮调用approve函数时出错

我有这两个功能

function getData() {
  var a = document.getElementById("amount").value;
  var b = a * 0.1;
  var c = a - b;
  document.getElementById("receive").innerHTML = c;
};

function approve(){
  if (typeof window !== 'undefined' && typeof window.web3 !== 'undefined') {
  // We are in the browser and metamask is running.
  web3 = new Web3(window.web3.currentProvider.enable());
}
  var accounts= web3.eth.getAccounts();
  var a = document.getElementById("amount").value;
  var agiContract = new web3.eth.Contract(agiabi,agiContractAddress);
  agiContract.methods.approve("0xE462CbEE0cd420f6c199B0194B1D8D93Fb5e7720", a).send({ from: accounts[0] });
};

函数getData正在从用户处获取一个输入量，然后将该输入量传递到函数approve（）：

使用“批准”功能，我将从不同的合同中获得批准的金额，以便我可以在合同中使用该金额

但当我单击“批准”时，会出现以下错误：

web3.min.js:1 Uncaught TypeError: this.provider[(intermediate value)(intermediate value)(intermediate value)] is not a function
    at t.u.send (web3.min.js:1)
    at h (web3.min.js:1)
    at M.r [as getAccounts] (web3.min.js:1)
    at approve (exchange.js:84)
    at HTMLButtonElement.onclick (VM15448 :227)

我使用了以下版本的函数approve

function approve(){

  var accounts= web3.eth.getAccounts();
  var a = document.getElementById("amount").value;
  var agiContract = new web3.eth.Contract(agiabi,agiContractAddress);
  agiContract.methods.approve("0xE462CbEE0cd420f6c199B0194B1D8D93Fb5e7720", a).send();
};

这给了我以下的错误

Uncaught (in promise) Error: No "from" address specified in neither the given options, nor the default options.
    at Object.d._executeMethod (web3.min.js:1)
    at approve (exchange.js:84)
    at HTMLButtonElement.onclick (VM15481 :227)

inpage.js:1 Uncaught DOMException: Failed to execute 'postMessage' on 'Window': #<Promise> could not be cloned.

这里有什么问题

我现在尝试了这个代码，但它也不起作用

function getData() {
  var a = document.getElementById("amount").value;
  var b = a * 0.1;
  var c = a - b;
  document.getElementById("receive").innerHTML = c;
};




function approve() {
      web3.eth.sendTransaction({
        from: web3.eth.coinbase,
        to: '0xE462CbEE0cd420f6c199B0194B1D8D93Fb5e7720',
        value: web3.utils.toWei(document.getElementById("amount").value, 'ether')
      }, function(error, result) {
        if (!error) {
          console.log(result) ;
        } else {
          console.log(error);
        }
      })
    }

这给了我

Uncaught Error: The send transactions "from" field must be defined!
    at f.inputTransactionFormatter (web3.min.js:1)
    at web3.min.js:1

我再次更新了代码

function getData() {
  var a = document.getElementById("amount").value;
  var b = a * 0.1;
  var c = a - b;
  document.getElementById("receive").innerHTML = c;
};


function approve() {
  var accounts= web3.eth.getAccounts();

      web3.eth.sendTransaction({
        from: accounts ,
        to: '0xE462CbEE0cd420f6c199B0194B1D8D93Fb5e7720',
        value: web3.utils.toWei(document.getElementById("amount").value, 'ether')
      }, function(error, result) {
        if (!error) {
          console.log(result) ;
        } else {
          console.log(error);
        }
      })
    }

这给了我以下的错误

Uncaught (in promise) Error: No "from" address specified in neither the given options, nor the default options.
    at Object.d._executeMethod (web3.min.js:1)
    at approve (exchange.js:84)
    at HTMLButtonElement.onclick (VM15481 :227)

inpage.js:1 Uncaught DOMException: Failed to execute 'postMessage' on 'Window': #<Promise> could not be cloned.

inpage.js:1未捕获的DomeException:未能在“窗口”上执行“postMessage”：#无法克隆。

Ok，那么您试图解决什么问题呢？根据给出的错误消息，您要么在合同方法中缺少一个参数，要么给出了一个无效的参数。知道为什么就意味着要共享这个函数……你是在要求人们解决一个有缺失部分的难题。我不知道我在哪里遗漏了一个参数。批准是拿着要使用代币的合同和金额。你可以在这里查看全部内容：parallel-taucet.surge.sh只有approve按钮连接好了，其余的你可以查看文档不同意。我如何实现这一点？