<input type="button" onclick="alert(''test'')" id="button1">

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form1.cs

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using mshtml;

namespace WindowsApplication2
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private AxSHDocVw.AxWebBrowser axWebBrowser1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;

public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
this.axWebBrowser1 = new AxSHDocVw.AxWebBrowser();
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
((System.ComponentModel.ISupportInitialize)(this.axWebBrowser1)).BeginInit();
this.SuspendLayout();
//
// axWebBrowser1
//
this.axWebBrowser1.Enabled = true;
this.axWebBrowser1.Location = new System.Drawing.Point(80, 184);
this.axWebBrowser1.OcxState = ((System.Windows.Forms.AxHost.State)(resources.GetObject("axWebBrowser1.OcxState")));
this.axWebBrowser1.Size = new System.Drawing.Size(300, 150);
this.axWebBrowser1.TabIndex = 0;
//
// button1
//
this.button1.Location = new System.Drawing.Point(160, 96);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(88, 24);
this.button1.TabIndex = 1;
this.button1.Text = "button1";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// button2
//
this.button2.Location = new System.Drawing.Point(304, 96);
this.button2.Name = "button2";
this.button2.TabIndex = 2;
this.button2.Text = "button2";
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(584, 397);
this.Controls.Add(this.button2);
this.Controls.Add(this.button1);
this.Controls.Add(this.axWebBrowser1);
this.Name = "Form1";
this.Text = "Form1";
((System.ComponentModel.ISupportInitialize)(this.axWebBrowser1)).EndInit();
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}

private void button1_Click(object sender, System.EventArgs e)
{
object x = System.Reflection.Missing.Value;
axWebBrowser1.Navigate(@"E:\Documents and Settings\Administrator\桌面\dddd.htm", ref x, ref x, ref x, ref x);
}

private void button2_Click(object sender, System.EventArgs e)
{
mshtml.IHTMLDocument2 doc = (mshtml.IHTMLDocument2)axWebBrowser1.Document;
mshtml.IHTMLFormElement f1 =(mshtml.IHTMLFormElement)doc.all.item ("form1",0);
((mshtml.IHTMLFormElement)(f1)).submit();
mshtml.IHTMLElement Element = (mshtml.IHTMLElement)doc.all.item("button1", 0);
Element.click();
}
}
}