ASP .NET调用javascript中Response.Write和ClientScript.RegisterStartupScript的区别

StringBuilder sb = new StringBuilder(); 
sb.Append("<script language=javascript>"); 
sb.Append("alert(document.forms.length);"); 
sb.Append("</script>"); 

Response.Write(sb.ToString()); 
ClientScript.RegisterStartupScript(this.GetType(), "test", sb.ToString()); 
 
可以明显的看到，Response.Write得到的是0，ClientScript.RegisterStartupScript得到的是1。