以太坊DAPP开发实战视频教程的语法版本问题?

image.png 参考“51CTO观看DAPP”开发实战,因为视频教程为早期录制,在学习编写过程中与当前WEB3.js版本不同,在浏览器执行过程中出现了多个方法找不到,附源码,还请指教那些方法需要修改,能尽快跑通。 image.png

<html>
<head>
  <meta charset="UTF-8">
  <title>First DAPP Demo</title>
  <link rel="stylesheet" type="text/css" href="main.css">
  <script src="https://cdn.jsdelivr.net/gh/ethereum/web3.js/dist/web3.min.js"></script>
</head>
<body>
  <div class="container">
    <h1>First DAPP Demo</h1>
    <h2 id="info"></h2>
    <label>姓名:</label>
    <input id="name" type="text">
    <label>年龄:</label>
    <input id="age" type="text">
    <button id="button">更新内容</button>
  </div>
  <script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
  <script>
    console.log("web3:" + web3);
    if (typeof web3 !== 'undefined') {
      web3 = new Web3(web3.currentProvider);
    } else {
      web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
    }
    //得到合约变量
    var infoContract = new web3.eth.Contract([{
        "constant": true,
        "inputs": [],
        "name": "getInfo",
        "outputs": [{
            "name": "",
            "type": "string"
          },
          {
            "name": "",
            "type": "uint256"
          }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
      },
      {
        "constant": false,
        "inputs": [{
            "name": "_name",
            "type": "string"
          },
          {
            "name": "_age",
            "type": "uint256"
          }
        ],
        "name": "setInfo",
        "outputs": [],
        "payable": false,
        "stateMutability": "nonpayable",
        "type": "function"
      }
    ]);

    var info = infoContract.at('0xda873b8dd76c861723e869269bc13a5a2999208f');
    info.getInfo(function(error, result) {
      if (!error) {
        $("#info").html(result[0] + ' ( ' + result[1] + ' years old )');
      }
    });

    $("#button").click(function() {
      var name = $("#name").var();
      var age = $("#age").var();
      info.setInfo(name, age, function(error, result) {
        if (!error) {
          console.console.log("set ok");;
        }
      })
    });
  </script>
</body>
</html>
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最佳答案 2020-04-13 20:16

代码已更新:

查看: https://github.com/xilibi2003/DAppDemos/

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  • 张云龙 提出于 2020-02-23 20:25