// Modern dapp browsers...
    if (window.ethereum) {
        window.web3 = new Web3(ethereum);
        try {
            // Request account access if needed
            console.log("window.ethereum");
            ethereum.enable();
        } catch (error) {
            // User denied account access...
        }
    }
    // Legacy dapp browsers...
    else if (window.web3) {
        window.web3 = new Web3(web3.currentProvider);
        console.log("window.currentProvider");
        // Acccounts always exposed

    }
    // Non-dapp browsers...
    else {
        console.log('Non-Ethereum browser detected. You should consider trying MetaMask!');
    }

    console.log("version");
    var version = web3.version;
    console.log(version);