ModelExplorerWindow.cs

using System;
using System.Reflection;
using System.Text;
using UnityEditor;
using UnityEngine;

public class ModelExplorerWindow : EditorWindow {

    [MenuItem("Window/Example03")]
    static void Example3()
    {
        var window = ModelExplorerWindow.GetWindow<ModelExplorerWindow>();
        window.Show();

        var thisWindowGuiView = typeof(EditorWindow).GetField("m_Parent", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(window);

        Type webViewType = GetTypeFromAllAssemblies("WebView");
        var webView = ScriptableObject.CreateInstance(webViewType);

        Rect webViewRect = new Rect(0, 0, 1024, window.position.height);
        webViewType.GetMethod("InitWebView").Invoke(webView, new object[] { thisWindowGuiView, (int)webViewRect.x, (int)webViewRect.y, (int)webViewRect.width, (int)webViewRect.height, true });
        webViewType.GetMethod("LoadURL").Invoke(webView, new object[] { Application.dataPath + "/ModelExplorer/index.html" });


        var invokeJSMethod = webViewType.GetMethod("ExecuteJavascript");
        if (invokeJSMethod != null)
        {
            EditorApplication.update += () => invokeJSMethod.Invoke(webView, new object[] { PrepareJSMethod("example", "changeText", Time.realtimeSinceStartup.ToString()) });

        }
        else
            Debug.LogError("No InvokeJSMethod is found.");
    }

    private static string PrepareJSMethod(string objectName, string name, params object[] args)
    {
  
            StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.Append(objectName);
            stringBuilder.Append('.');
            stringBuilder.Append(name);
            stringBuilder.Append('(');
            bool flag = true;
            for (int i = 0; i < args.Length; i++)
            {
                object obj = args[i];
                if (!flag)
                {
                    stringBuilder.Append(',');
                }
                bool flag2 = obj is string;
                if (flag2)
                {
                    stringBuilder.Append('"');
                }
                stringBuilder.Append(obj);
                if (flag2)
                {
                    stringBuilder.Append('"');
                }
                flag = false;
            }
            stringBuilder.Append(");");
            return stringBuilder.ToString();
        
    }


    public static Type GetTypeFromAllAssemblies(string typeName)
    {
        Assembly[] assemblies = System.AppDomain.CurrentDomain.GetAssemblies();
        foreach (Assembly assembly in assemblies)
        {
            Type[] types = assembly.GetTypes();
            foreach (Type type in types)
            {
                if (type.Name.Equals(typeName, StringComparison.CurrentCultureIgnoreCase) ||
                    type.Name.Contains('+' + typeName)) //+ check for inline classes
                    return type;
            }
        }
        return null;

    }

}