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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="../../libs/web3.js_v0.20.6/web3.min.js"></script>
</head>
<body>
<div>provider: <input id="provider" type="text" value="https://ropsten.infura.io"/></div>
<div><button onclick="example();">Set a new provider</button>
<div id="info"></div>
<script>
// ボタンクリック時に呼ばれます。
function example() {
// 新たなプロバイダをセットします。
var provider = document.getElementById("provider").value;
web3.setProvider(new web3.providers.HttpProvider(provider));
// 現在のプロバイダを表示します。
var currentProvider = web3.currentProvider;
console.log("currentProvider: ", currentProvider);
document.getElementById("info").innerText = "currentProvider: " + JSON.stringify(currentProvider);
}
window.onload = function() {
if (typeof web3 !== 'undefined') {
console.log("Using currentProvider: ", web3.currentProvider);
web3 = new Web3(web3.currentProvider);
} else {
console.log("Using infura");
web3 = new Web3(new Web3.providers.HttpProvider("https://mainnet.infura.io"));
}
}
</script>
</body>
</html>