//方法一
let abi = [...];       
let instance = await tronWeb.contract(abi,'contractAddress')
let result = await instance.function_name(para1,para2,...).call()
let result2 = await instance.function_name(para1,para2,...).send()

//方法二
可以省略abi这个参数
let instance = await tronWeb.contract().at('contractAddress');
let result = await instance.function_name(para1,para2,...).call()
let result2 = await instance.function_name(para1,para2,...).send()

//方法三
tronWeb.transactionBuilder.triggerConstantContract(contractAddress,functions, options,parameter,issuerAddress)
eg1:
let parameter = []
let transaction = await tronWeb.transactionBuilder.triggerSmartContract("419e62be7f4f103c36507cb2a753418791b1cdc182", "name()", {},
    parameter,"417946F66D0FC67924DA0AC9936183AB3B07C81126")
eg2:
let parameter1 =  [{type:'uint256',value:100}]
let transaction = await tronWeb.transactionBuilder.triggerSmartContract("419896f9376893d4882fa2375ab1732a943d19f8c2", "getTrxToTokenInputPrice(uint256)", {},parameter1,"412692a1d44cc5a51eefdb8e11e8cd1c20d802e474")