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How to analyze the web3.js call intelligent contract, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

The editor will use web3.js to follow a simple process of calling intelligent contracts.

1 using truffleinit command to generate intelligent contract framework

Code reference. The simple modifications to the automatically generated framework are as follows:

Contracts\ Migrations0.solpragma solidity ^ 0.4.23 position contract Migrations0 {/ / write a function to complete the addition operation function aAndb (uint a dint b) public constant returns (uint) {return astatb;}} migrations\ 1_initial_migration0.jsvar Migrations = artifacts.require (". / Migrations0.sol"); module.exports = function (deployer) {deployer.deploy (Migrations);}; 2 compilation

Compile it on truffle develop

Generate the json file in the. / build/contracts file

Where:

"abi": [{"constant": true, "inputs": [{"name": "a", "type": "uint256"}, {"name": "b", "type": "uint256"}], "name": "aAndb" "outputs": [{"name": "," type ":" uint256 "}]," payable ": false," stateMutability ":" view "," type ":" function "}]

Compressed abi:

[{"constant": true, "inputs": [{"name": "a", "type": "uint256"}, {"name": "b", "type": "uint256"}], "name": "aAndb", "outputs": [{"name": "type": "uint256"}], "payable": false, "stateMutability": "view", "type": "function"}] 3 deployment

Contract address of Migrations0: 0x345ca3e014aaf5dca488057592ee47305d9b3e10

4 call

Web3.eth.contract:

Web3.eth.contract (abiArray)

Create a contract object for Solidity to initialize the contract at an address.

Parameters:

Array-one or more functions that describe contracts, ABI objects for events.

Return value:

Object-A contract object.

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