webix导出数据到Excel时如何自定义数据格式?

要自定义Webix导出数据到Excel的数据格式，可通过以下步骤实现：

1. 创建需要导出的数据集对象，并将其绑定到Webix表格组件上，例如：

var grid = webix.ui({ view:"datatable", columns:[ { id:"id", header:"#", width:50}, { id:"title", header:"Film title", width:200}, { id:"year", header:"Released", width:80}, { id:"votes", header:"Votes", width:100}, { id:"rating", header:"Rating", width:100} ], data:[ { id:1, title:"The Shawshank Redemption", year:1994, votes:678790, rating:9.2}, { id:2, title:"The Godfather", year:1972, votes:511495, rating:9.2}, { id:3, title:"The Godfather: Part II", year:1974, votes:319352, rating:9.0}, { id:4, title:"The Dark Knight", year:2008, votes:620806, rating:9.0}, { id:5, title:"12 Angry Men", year:1957, votes:164558, rating:8.9}, { id:6, title:"Schindler's List", year:1993, votes:365918, rating:8.9}, { id:7, title:"Pulp Fiction", year:1994, votes:641559, rating:8.9}, { id:8, title:"The Lord of the Rings: The Return of the King", year:2003, votes:585669, rating:8.9}, { id:9, title:"The Good, the Bad and the Ugly", year:1966, votes:157043, rating:8.9}, { id:10, title:"Fight Club", year:1999, votes:733250, rating:8.8} ] });

2. 创建一个导出数据的按钮，并在按下该按钮时将数据导出到Excel文件中，例如：

webix.ui({ view:"button", value:"Export to Excel", click:function(){ var exportData = [];

    //Convert data to required format
    grid.eachRow(function(row){
        var exportRow = {};
        grid.eachColumn(function(column){
            exportRow[column.id] = grid.getItem(row)[column.id];
        });
        exportData.push(exportRow);
    });

    //Customize data
    for(var i=0; i<exportData.length; i++){
        exportData[i].rating = "Rating: "+exportData[i].rating;
        exportData[i].votes = "Votes: "+exportData[i].votes;
    }

    //Export data
    webix.toExcel(exportData, {
        filename:"top-movies",
        name:"Top Movies",
        columns:[
            {header:"Film title", width:200},
            {header:"Released", width:80},
            {header:"Votes", width:100},
            {header:"Rating", width:100}
        ]
    });
}

});

在上述代码中，我们实例化了一个按钮组件，并在点击它时，使用Webix的eachRow和eachColumn方法将表格的数据转换为导出数据格式。在这之后，我们可以通过修改导出数据数组中的元素来自定义数据格式。最后，我们使用Webix的toExcel方法将导出数据导出到Excel文件