js 后台异步执行

public void AlertMsg(string msg, bool async)
{
string script = string.Format("alert('{0}'); ", msg);
RegisterClientScript(script, async);

public void RegisterClientScript(string script, bool async)
{
if (async)
{
System.Web.UI.ScriptManager.RegisterStartupScript(this.Page, this.GetType(), Guid.NewGuid().ToString(), script, true);
}
else
{
this.Page.ClientScript.RegisterStartupScript(this.GetType(), Guid.NewGuid().ToString(), script, true);
}
}