菜鸟问题:JavaScrpit全局变量: 为什么不能在调用第二个函数的时候获得先前个函数的变量值

luojihaidao 你好! 谢谢你的回复! 问题不是 return false这里, 因为第一个函数并没有进行进这个if语句.我注释了这个if也没有解决问题，问题应该出现在其他地方.

OK. Part1:<%@ Page Language="C#" AutoEventWireup="true" CodeFile="uploadtest.aspx.cs" Inherits="uploadtest" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>无标题页</title>
        <script language="javascript">

        function doSomething()
        {
          var doc = document.forms[0];
          str=document.getElementById("FileUpload1").value;
          if(str=="")
          {
             alert('Please select a file which you want to upload...');
             return false;
          }

          mydate=new Date();
  minutes=mydate.getMinutes().toString();
  seconds=mydate.getSeconds().toString();
   hours=mydate.getHours().toString();
   miliseconds=mydate.getMilliseconds().toString();
          doc.submit();
         }
      </script>        <script language="javascript">

         function test()
            {
             alert(minutes);
             alert(seconds);
             alert(hours);
             alert(miliseconds);
              mydate2=new Date();
    var minutes2=mydate2.getMinutes().toString();
     var seconds2=mydate2.getUTCSeconds().toString();
     var hours2=mydate2.getHours().toString();
     var miliseconds2=mydate2.getMilliseconds().toString();

     if(hours2==hours)
         var time1=((minutes2.valueOf()-minutes.valueOf())*60+(seconds2.valueOf()-seconds.valueOf())+(miliseconds2.valueOf()-miliseconds.valueOf())/1000);
     else
    time1=((seconds2.valueOf()-seconds.valueOf())+(miliseconds2.valueOf()-miliseconds.valueOf())/1000)+3600+(minutes2.valueOf()-minutes.valueOf())*60;
    var speed1=((605569/1024)/time1);     var time=time1.toFixed(3);
    var time2=time1.toFixed(2);
          var speed=speed1.toFixed(2);

      alert("Downloaded file size is 605569 bytes. The time used is "+time*1000+" miliseconds.\n"
     +"605569 bytes received in "+time2+"  seconds.\nThe everage speed is "+speed+" kBytes/second, or "
      +speed*8+ " kpbs." );
  //    window.location="scalc.aspx?"+time+"&"+time2+"&"+speed;
              alert(filesize);
              alert('test last');
             }
    </script>

</head>
<body>
    <form id="form1"  enctype="multipart/form-data" runat="server">
    <div>
         
        <asp:Label ID="Label2" runat="server" ForeColor="LightCoral" Text="Please select a file to upload:"></asp:Label><br />
         
        <asp:FileUpload ID="FileUpload1" runat="server" />
         
        <asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="return doSomething();" OnClick="Button1_Click" /><br />
                      <br />
         <asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl="~/Default.aspx">Return main page</asp:HyperLink><br />
        <br />
        <asp:Literal ID="Literal1" runat="server"></asp:Literal>
        <br />
    </div>
    </form></body>
</html>

part2:using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class uploadtest : System.Web.UI.Page
{    protected void Page_Load(object sender, EventArgs e)
    {
      //  this.Button1.Attributes.Add("onClick", "return doSomething();");
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        int filelength=0;

        if (FileUpload1.PostedFile != null)
        {
            FileUpload1.Visible = true;
            string strDir = FileUpload1.PostedFile.FileName;            int myPos = strDir.LastIndexOf("\\");
             string strFileName;
             if (myPos > 0)
                 strFileName = strDir.Substring(myPos);
             else
             {
                 strFileName = strDir;
                 strFileName="\\"+strFileName;
             }
          //   this.Response.Write(strFileName);
             string strPath;
            strPath = Server.MapPath(".") + strFileName;
          //  this.Response.Write(strPath);
          //  this.Label3.Text = "保存路径: ";
          //  this.Label3.Text += strPath;
            FileUpload1.PostedFile.SaveAs(strPath);
          //  this.Label2.Visible = true;
          //  this.Label4.Text = "文件名称: ";
          //  this.Label4.Text += FileUpload1.PostedFile.FileName;
          //  this.Label5.Text = "文件类型: ";
          //  this.Label5.Text += FileUpload1.PostedFile.ContentType;
          //  this.Label6.Text = "文件大小: ";
          //  this.Label6.Text += FileUpload1.PostedFile.ContentLength.ToString();
            filelength = this.FileUpload1.PostedFile.ContentLength;
        //    string s5 = filelength.ToString();
        //    this.Response.Write("<script language=\"javascript\" type=\"text/javascript\">alert(1);</script>");
            this.Response.Write("<script language=\"javascript\" type=\"text/javascript\">var filesize=" + filelength.ToString() + "</script>");
          //  this.Response.Write("<input id=\"aaaa\" type=\"hidden\" runat=\"server\"  Text=\"aaa\">");
         //   this.Label1.Text = filelength.ToString();
         //   this.Label1.Visible = true;
         //   this.Response.Write(strPath);
         //   this.Response.Write("\n");
        }        string str;
        str = "<script language='javascript'>";
        str += "test()";
        str += "</script>";
        //Literal1.Visible=true;
        Literal1.Text = str;
    }}

当执行完doSomething()后页面回发返回的是一个新的页面你在doSomething中所定义的变量已经不存在所以会是'undefined'

Asp?　不会，　<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <title></title>
    <script language="javascript">

        function doSomething()
        {
         // var doc = document.forms[0];
        //  str=document.getElementById("FileUpload1").value;
       ////   if(str=="")
        //  {
         //   alert('Please select a file which you want to upload...');
        //    return false;
        //  }

          mydate=new Date();
  minutes=mydate.getMinutes().toString();
  seconds=mydate.getSeconds().toString();
  hours=mydate.getHours().toString();
  miliseconds=mydate.getMilliseconds().toString();  // alert(miliseconds);
          //doc.submit();
        }
function test()
            {
            alert(window.minutes);                  //这里alert出来的是"undefined"
            alert(window.seconds);                  //这里alert出来的是"undefined"
            alert(window.hours);                    //这里alert出来的是"undefined"            alert(window.miliseconds);
              mydate2=new Date();
    var minutes2=mydate2.getMinutes().toString();
    var seconds2=mydate2.getUTCSeconds().toString();
    var hours2=mydate2.getHours().toString();
    var miliseconds2=mydate2.getMilliseconds().toString();
      }
  doSomething();
  test();
      </script>


</head>
<body></body>
</html>写了一个HTML的。　你看看吧

参考:
doSomething()的
  minutes=mydate.getMinutes().toString();
  seconds=mydate.getSeconds().toString();
  hours=mydate.getHours().toString();
  miliseconds=mydate.getMilliseconds().toString();
1)
写Cookie/session中
执行test() 时,读出来对比
2)
赋值给<input type=hidden>--传来传去

最后采用的方法跟caiying2009比较类似,传了几个hidden进去,然后再服务器端用JS将这几个数返回到客户端.谢谢大家!特别谢谢caiying2009!

调试易

菜鸟问题:JavaScrpit全局变量: 为什么不能在调用第二个函数的时候获得先前个函数的变量值

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