var items = [[{
  text: "第一行第一列"
}, {
  text: "第一行第二列"
}, {
  text: "第一行第三列"
}]];

var header = [[{
  text: "表头1"
}, {
  text: "表头2"
}, {
  text: "表头3"
}]];

BI.createWidget({
  type: "bi.preview_table",
  header: header,
  element: 'body',
  columnSize: [100, "", 50],
  items: items
});