两种方法可以实现

1.客户端:

<script language="javascript" type="text/javascript">

window.onload=function getTime()
{
    var date = new Date(); //日期对象
    var now = "";
    now = date.getFullYear()+"-"; //读英文就行了
    now = now + (date.getMonth()+1)+"-"; //取月的时候取的是当前月-1如果想取当前月+1就可以了
    now = now + date.getDate();
    document.getElementById("txtAddDate").value=now;
}
</script>

2.服务器端:

protected override void Render(HtmlTextWriter writer)
     {
         //继承模板页的内容页加入 onload 事件
         System.IO.StringWriter sw = new System.IO.StringWriter();
         HtmlTextWriter htw = new HtmlTextWriter(sw);
         base.Render(htw);
         writer.Write(sw.ToString().Replace("<body", "<body onload=javascript:alert('欢迎光临!');"));
     }

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