解决方法
使用grid.styleColumn(columnId,css)：
var grid = new Grid({
store: store,columns: [
{ id: "artist",label: "Artist",field: "Artist"},{ id: "name",label: "Song",field: "Name"},{ id: "gerne",label: "Genre",field: "Genre"}
]
},"grid-placeholder");
// to hide column with id="name"
grid.styleColumn("name","display: none;");
// to show it
grid.styleColumn("name","display: table-cell;");