tronWeb.contract
Creates a contract object that wraps an ABI. Allows you to easily call functions on on the contract.
Usage
tronWeb.contract()
Parameters
abi:Optionally provide the ABI for a contract.
address:Optionally provide the address for a contract. Hex or Base58 format
Returns
Object
Example
//example 1:Create the contract object through contract address and ABI
let instance = await tronWeb.contract([{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"}],"TREwN2qRkME9TyQUz8dG6HfjEyKGMPHAS5")
//example 2:First create an empty contract object, and then specify the contract address by at() function. If the abi is on the chain, at() function will load ABI automatically , else you need to load it manually
let instance = await tronWeb.contract().at("TREwN2qRkME9TyQUz8dG6HfjEyKGMPHAS5");
If the contract ABI does not exist on the chain, Please invoke loadAbi function to manually load the contract ABI. An example is as below:
//example 1
let instance =await tronWeb.contract([{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"}],"TREwN2qRkME9TyQUz8dG6HfjEyKGMPHAS5")
let res = await instance.totalSupply().call({_isConstant:true})
//example 2
let instance = await tronWeb.contract().at("TREwN2qRkME9TyQUz8dG6HfjEyKGMPHAS5");
instance.loadAbi([{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"}]);
let res = await instance.totalSupply().call({_isConstant:true})