script.js

<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="http://rawgit.com/ethereum/web3.js/0.16.0/dist/web3.min.js"></script>


<script>
    if (typeof web3 !== 'undefined') {
        web3 = new Web3(web3.currentProvider);
    } else {
        web3 = new Web3(new Web3.providers.HttpProvider("SUA URL DO NÓ AQUI"));
    }
    var account = web3.eth.accounts[0];
    var accountInterval = setInterval(function () {
        var accountInterval = setInterval(function () {
            if (web3.eth.accounts[0] !== account) {
                account = web3.eth.accounts[0];
                document.getElementById("address").innerHTML = account;
            }
        }, 100);

    });
    var HodlContract = web3.eth.contract(SUA ABI AQUI);
    window.alert('Sua mensagem aqui.');
    var Hodl = HodlContract.at('ENDEREÇO DO CONTRATO');
    console.log(Hodl);
    address = account


    $("#button1").click(function (web3) {
        var tx = Hodl.depositarInvestimento({
            from: address,
            gas: "3000000",
            to: "ENDEREÇO DO CONTRATO",
            value: 1000000000000000000 * ($("#valor")[0].value),
            data: ""
        }, function (err, transactionHash) {
            if (!err)
                console.log(transactionHash);
        })
    })

    $("#button2").click(function (web3) {
        var tx = Hodl.retirarInvestimento("\"" + $("#senha")[0].value + "\"", {
            from: address,
            gas: "3000000",
            to: "ENDEREÇO DO CONTRATO",
            value: "0",
            data: ""
        }, function (err, transactionHash) {
            if (!err)
                console.log(transactionHash);
        })
    })

</script>