Question

我想阻止用户在input[type='text']为空时输入空格键。如果不是在输入空格键后，应抓取input[type='text']的值并将其放在span标记中。现在我想指定for-loop来执行第二部分（我的意思是value只放入span）五次。当 5 span已经存在时，不再这样做了。我应该在哪里添加for-loops？这是我的代码：

$(function() 
   {
        $("#tags-selected").on('keypress', function(e) 
        {
                var tags_selected=$("#tags-selected").val();    
                if(e.which === 32)
                {
                    if(!this.value.length)
                        e.preventDefault();
                    else
                        $("<span class='suggested-tag'>"+tags_selected+"<span class='closee'>XX</span></span>").insertBefore("#tags-selected");
                        $("#tags-selected").val('');
                        $(".tags-review").fadeOut(300);

                } 

        });
    });

Answer 1

您无需为此添加循环。只需使用类suggest-tag检查附加span元素的长度。并且只有在长度小于5时才附加新元素：

        string pitpivotNam1 = "table1";
        Dictionary<String, Excel.PivotField> pFields = new Dictionary<String, Excel.PivotField>();
        Excel.PivotTable pivotTable1 = null;
        Excel.Range pivotDest = excelApp.Worksheets["PivotTable"].Cells[1, 1];

        excelApp.Worksheets[sheetData].Activate();
        int countColmn = excelApp.Cells[1, 1].End(Excel.XlDirection.xlToRight).Column;
        var headerNam = excelApp.Range[excelApp.Cells[1, 1], excelApp.Cells[1, countColmn]].Value;

        // Data Source for PivotTable
        Excel.Range pivotData = excelApp.Worksheets[sheetData].usedRange;
        Excel.PivotCache pivotcache = excelApp.ActiveWorkbook.PivotCaches().Create(Excel.XlPivotTableSourceType.xlDatabase, pivotData.Address/*, Excel.XlPivotTableVersionList.xlPivotTableVersion15*/);
        excelApp.Worksheets[sheetDest].Activate();
        pivotTable1 = excelApp.Worksheets[sheetDest].PivotTables.Add(pivotcache, pivotDest, pitpivotNam1, useDefault/*, Excel.XlPivotTableVersionList.xlPivotTableVersion15*/);

        // Create Dynamically PivotFields
        for (int i = 1; i <= headerNam.Length - 1; i++)
        {

            pFields.Add("test" + i.ToString(), (Excel.PivotField)pivotTable1.PivotFields(i));

        }

        pFields["test20"].Orientation = Excel.XlPivotFieldOrientation.xlDataField;
        pFields["test20"].Function = Excel.XlConsolidationFunction.xlAverage;
        pFields["test43"].Orientation = Excel.XlPivotFieldOrientation.xlDataField;
        pFields["test43"].Function = Excel.XlConsolidationFunction.xlAverage;
        pFields["test66"].Orientation = Excel.XlPivotFieldOrientation.xlDataField;
        pFields["test66"].Function = Excel.XlConsolidationFunction.xlAverage;
        pFields["test20"].Name = "DVP & R Progress";

        // First Chart
        excelApp.ActiveSheet.Shapes.AddChart.Select();
        excelApp.ActiveChart.SetSourceData(pivotTable1.TableRange1);

        // Second PivotTable
        string pitpivotNam2 = "table2";
        Excel.PivotTable pivotTable2 = null;
        Dictionary<String, Excel.PivotField> pFields2 = new Dictionary<String, Excel.PivotField>();
        Excel.Range pivotDest2 = excelApp.Worksheets["PivotTable"].Cells[20, 1];

        excelApp.Worksheets[sheetData].Activate();
        int countColmn2 = excelApp.Cells[1, 1].End(Excel.XlDirection.xlToRight).Column;
        var headerNam2 = excelApp.Range[excelApp.Cells[1, 1], excelApp.Cells[1, countColmn2]].Value;

        // Data Source for PivotTable
        Excel.Range pivotData2 = excelApp.Worksheets[sheetData].usedRange;
        Excel.PivotCache pivotcache2 = excelApp.ActiveWorkbook.PivotCaches().Create(Excel.XlPivotTableSourceType.xlDatabase, pivotData2.Address/*, Excel.XlPivotTableVersionList.xlPivotTableVersion15*/);
        excelApp.Worksheets[sheetDest].Activate();
        pivotTable2 = excelApp.Worksheets[sheetDest].PivotTables.Add(pivotcache2, pivotDest2, pitpivotNam2, useDefault/*, Excel.XlPivotTableVersionList.xlPivotTableVersion15*/);

        // Create Dynamically PivotFields
        for (int i = 1; i <= headerNam2.Length - 1; i++)
        {

            pFields2.Add("test" + i.ToString(), (Excel.PivotField)pivotTable2.PivotFields(i));

        }

        pFields2["test17"].Orientation = Excel.XlPivotFieldOrientation.xlColumnField;
        Excel.PivotField dataField = pivotTable2.DataPivotField;
        pFields2["test17"].Orientation = Excel.XlPivotFieldOrientation.xlDataField;
        pFields2["test17"].Function = Excel.XlConsolidationFunction.xlCount;
        pFields2["test40"].Orientation = Excel.XlPivotFieldOrientation.xlDataField;
        pFields2["test40"].Function = Excel.XlConsolidationFunction.xlCount;
        pFields2["test63"].Orientation = Excel.XlPivotFieldOrientation.xlDataField;
        pFields2["test63"].Function = Excel.XlConsolidationFunction.xlCount;
        dataField.Orientation = Excel.XlPivotFieldOrientation.xlRowField;

        // Secound Chart
        excelApp.ActiveSheet.Shapes.AddChart.Select();
        excelApp.ActiveChart.SetSourceData(pivotTable2.TableRange1);

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