使用javascript、solidity和html时出现Web3模块未定义错误

我正在尝试为我的solidity合同构建UI。到目前为止，文件如下：

index.html : which contains ui part(tables, buttons, etc)

    server.js:

        var express = require('express');
        var app = express();
        app.use('/', express.static(__dirname + '/'));
        app.listen(8080,() => console.log('Example app listening on port 8080!'));

    index.js:
    web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
    abi = JSON.parse('[{"constant":true,"inputs"......');
    // In your nodejs console, execute contractInstance.address to get the address at which the contract is deployed and change the line below to use your deployed address
    VotingContract = web3.eth.contract(abi);
    contractInstance = VotingContract.at('deployed address name');
    //rest of the functions required..

Solidity file: this contains the contract that will deployed on the blockchain

当我在localhost上运行服务器时，我得到一个错误，说没有定义web3。 有人能帮我吗？？ 谢谢你

我找到了答案。 我只需要在server.js文件中包含web3：

var express = require('express');
var Web3 = require('web3');