C#和网页js互调代码

1、先写个网页放在主程序目录下：test.html

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title>测试网页</title>
    <script>
        function MyFunc(num) {
            alert("大家好，这是js代码中的Alert，我将返回30！");
            return 30 + num;
        }
    </script>
</head>
<body>
    <input type="button" onclick="window.external.MyMessageBox('javascript访问C#代码');" value="点击测试调用C#中的方法！" />
</body>
</html>

2、打开WinForm，拖个按钮，拖个WebBrowser。

3、写C#代码并测试

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WebWithForm
{
    [System.Runtime.InteropServices.ComVisible(true)]
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.webBrowser2.ObjectForScripting = this;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.webBrowser2.Navigate(Application.StartupPath + "\test.html");
        }

        private void button1_Click(object sender, EventArgs e)
        {
            var result = this.webBrowser2.Document.InvokeScript("MyFunc", new object[] { 30 });
            this.Text = this.webBrowser2.Version.ToString();
            label1.Text = "网页返回：" + result;
        }

        public void MyMessageBox(string message)
        {
            MessageBox.Show("这是C#的MessageBox提示：" + message);
        }

    }
}

4、运行效果：