ASP.NET后台输出js

 StringBuilder sb = new StringBuilder();
  sb.Append("<input type=\"text\" id=\"txtGo\" name=\"txtGo\" style=\" width:30px\" >");
                sb.Append("<input type=\"button\" id=\"btnGo\" name=\"btnGo\" value=\"跳转\" onclick=\"pagego();\" >");

 string scriptstrs = "";
                scriptstrs += "function pagego(){";
                scriptstrs += " var val = document.getElementById(‘txtGo‘).value;";
                scriptstrs +=" if (val >"+PageCount+") {alert(‘不能大于‘+"+PageCount+");}";
                scriptstrs += "else {window.location.href = ‘WordManager.aspx?page=‘+val;}}";
                if (!Page.ClientScript.IsClientScriptBlockRegistered(this.GetType(), "keys"))
                {

                    Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "keys", scriptstrs, true);

                }

  string scriptstrs = "<script>alert(‘欢迎光临！‘);</script>";
        if (!Page.ClientScript.IsStartupScriptRegistered(this.GetType(),"welcome"))
        {
            Page.ClientScript.RegisterStartupScript(this.GetType(), "welcome", scriptstrs);
        }

if (!Page.ClientScript.IsClientScriptIncludeRegistered(this.GetType(), "keys"))//判断keys是否已注册过
{
   Page.ClientScript.RegisterClientScriptInclude("keys", "testjs.js");     
}