add erc20 and modify basic chain folder

src/basic_chain/js/test/db.js

@@ -0,0 +1,34 @@
+'use strict';
+
+var crypto = require('crypto');
+var ed = require('ed25519');
+var BlockChain = require("../blockchain");
+var Consensus = require("../consensus/dpos");
+
+var password = 'I am tester!';
+
+var hash = crypto.createHash('sha256').update(password).digest();
+var keypair = ed.MakeKeypair(hash);
+
+let blockchains = [];
+for (var i = 0; i < 20; ++i) {
+    let blockchain = new BlockChain(Consensus, keypair, i);
+    blockchain.start();
+    blockchains.push(blockchain);
+}
+
+// setTimeout(() => {
+//     for (var i = 0; i < 20; ++i) {
+//         console.log(`${i} --> ${blockchains[i].list_peers()}`);
+//     }
+// }, 3000);
+
+setTimeout(async () => {
+    console.log("=================");
+    await blockchains[0].iterator_forward((block) => {
+        console.log("-----------------");
+        console.log(block.height);
+        console.log(block.hash);
+        return true;
+    }, blockchains[0].get_last_block().hash);
+}, 5000);