代币合约DAPP项目系统开发（技术方案）

　　//Deploy a single contract without constructor arguments

　　deployer.deploy(A);

　　//Deploy a single contract with constructor arguments

　　deployer.deploy(A,arg1,arg2,...);

　　//Don't deploy this contract if it has already been deployed

　　deployer.deploy(A,{overwrite:false});

　　//Set a maximum amount of gas and`from`address for the deployment

　　deployer.deploy(A,{gas:4612388,from:"0x...."});

　　//External dependency example:

　　//

　　//For this example,our dependency provides an address when we're deploying to the

　　//live network,but not for any other networks like testing and development.

　　//When we're deploying to the live network we want it to use that address,but in

　　//testing and development we need to deploy a version of our own.Instead of writing

　　//a bunch of conditionals,we can simply use the`overwrite`key.

　　deployer.deploy(SomeDependency,{overwrite:false});

　　var ERC20=artifacts.require("../contracts/Erc20.c")

　　module.exports=function(deployer,a){

　　deployer.deploy(ERC20,"1000000","bitcoin","BTC").then(function(instance){

　　deploy=instance;

　　return deploy.GetTotalSupply()

　　}).then(function(totalSupply){

　　console.log("totalSupply",totalSupply.toString());

　　return deploy.GetDecimals();

　　}).then(function(decimals){

　　console.log("decimals",decimals.toString());

　　return deploy.GetTokenName();

　　}).then(function(tokenName){

　　console.log("tokenName",tokenName);

　　return deploy.GetAmount("0x122369f04f32269598789998de33e3d56e2c507a")

　　}).then(function(balance){

　　console.log("balance",balance.toString());

　　})

　　};