test.js

var Web3 = require('web3');
var web3 = new Web3();
web3.setProvider(new web3.providers.HttpProvider('http://localhost:8545'));
var abi = [{
    "constant": false,
    "inputs": [{"name": "jsn", "type": "string"}],
    "name": "deposit",
    "outputs": [{"name": "", "type": "int256"}],
    "payable": false,
    "type": "function"
}, {
    "anonymous": false,
    "inputs": [{"indexed": true, "name": "_sender", "type": "address"}, {
        "indexed": false,
        "name": "jsn",
        "type": "string"
    }],
    "name": "Evt",
    "type": "event"
}];
var medApi = {MAIN_CONTRACT_ID: "0x5cb023C894D7838Ee7C0eE43AFD8D10D75Cd89bd"};
medApi.contract = new web3.eth.Contract(abi, medApi.MAIN_CONTRACT_ID);
medApi.contract.events.Evt({fromBlock: 0, toBlock: 'latest'},function () {
}).on('data',function (evt) {
        console.log("evt",evt);
    });