truffle网络设置

在使用truffle migrate进行智能合约test环境发布时如果未配置正确会出现以下异常：

$ truffle migrate
Error: No network specified. Cannot determine current network.
    at Object.detect (/usr/local/lib/node_modules/truffle/build/cli.bundled.js:43157:23)
    at /usr/local/lib/node_modules/truffle/build/cli.bundled.js:200497:19
    at finished (/usr/local/lib/node_modules/truffle/build/cli.bundled.js:43085:9)
    at /usr/local/lib/node_modules/truffle/build/cli.bundled.js:198408:14
    at /usr/local/lib/node_modules/truffle/build/cli.bundled.js:68162:7
    at /usr/local/lib/node_modules/truffle/build/cli.bundled.js:163793:9
    at /usr/local/lib/node_modules/truffle/build/cli.bundled.js:160353:16
    at replenish (/usr/local/lib/node_modules/truffle/build/cli.bundled.js:160873:25)
    at iterateeCallback (/usr/local/lib/node_modules/truffle/build/cli.bundled.js:160863:17)
    at /usr/local/lib/node_modules/truffle/build/cli.bundled.js:160838:16

导致上面异常的原因为是因为truffle.js里面未配置链接合约发布的环境地址，找到对应的truffle.js文件，修改代码为类似如下配置即可解决问题：

module.exports = {
    networks: {
        development: {
            host: "localhost",
            port: 8545,
            network_id: "*" // 匹配任何network id
         }
    }
};