Question

我是javascript的新手，并且我正在尝试制作一个程序来连续单击一个按钮，除非存在另一个按钮。（我也很想在第二个按钮出现时得到警报，但我不知道该怎么做。）

这就是我得到的：

Do {Let button=document.getElementById("find"); 
Let want= document.getElementById("bba"); 
setInterval(function(){ 
button.click();
}, 10000); } 
while (want.click=false)

我不断收到错误消息（语法不明）。我不确定该如何解决。

任何帮助将不胜感激！

Answer 1

仅查看您的代码，我就会看到两个主要错误。首先是您使用大写的do and let，JavaScript区分大小写，因此您需要使用小写字母。第二个是你写的

 For Each finalname In filenames
        row2 = 1
        Using reader As New StreamReader(finalname)

            Do Until reader.EndOfStream

                Dim line As String = reader.ReadLine

                Dim datetimestring As String = line.Substring(0, 22)
                datetimestring = datetimestring.Replace("""", "").Trim()
                datetimestring = datetimestring.Replace("-", "").Trim()


                Dim format As String = "dd/MM/yyyy hh:mm:ss tt"
                Dim time As DateTime = DateTime.Parse(datetimestring)
                Dim Dt = time.ToString(format)
                'Dim dtime As DateTime = DateTime.Parse(Dt)

                Dim c As String = line.Substring(22)
                c = c.Replace("-", "").Trim()

                Dim cmd1 As New SqlCommand("insert into table5([time] , [process], [oven], [line]) values ( @line , @line1, '" & oven & "', '" & row2 & "')", con1)
                cmd1.Parameters.Add("@line", SqlDbType.DateTime).Value = time
                cmd1.Parameters.Add("@line1", SqlDbType.NVarChar).Value = c
                con1.Open()
                cmd1.ExecuteNonQuery()
                con1.Close()
                row2 = row2 + 1

            Loop
            oven = oven + 2
            Dim str20 As String = "data source=10.239.213.40;uid=sa;pwd=Win32API;database=mbi"
            Dim con20 As New SqlConnection(str20)
            Dim com20 As String = "select top 9 * from table5 where process like '%Load lot clicked%' or process like '%''QCheck'' Button%' or process like '%''Start'' Button%' or process like '%Run Proc%' or process like '%Run Bin2 clicked%' or process like '%Started with Double click%' and oven ='2' order by oven, line desc"
            Dim Adpt20 As New SqlDataAdapter(com20, con1)
            Dim ds2 As New DataSet()
            Adpt20.Fill(ds2, "table5")
            DataGridView1.DataSource = ds2.Tables(0)

        End Using

    Next

您写的是分配而不是相等性检查。

while (want.click=false)

那是编写它的正确方法。

Answer 2

您应该做的是使用单个setInterval：

    window.setInterval(function() {
      if (!document.getElementById("button2")) {
 document.getElementById("button1").click();
    } else {
document.getElementById("button2").click();
alert("second button appeared");
    }
    }, 100);

抱歉，我在移动设备上。

Answer 3

您的do和let关键字大写。它们应该是小写。

Let want= document.`getElementById`("bba");

您应在此处使用三等号，而不是赋值运算符。

它应该是：let want === document.getElementById("bba");

Do-while循环和创建警报的问题

3 个答案: