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：js在table插入一條空白行tr

function insertlasttr(myTable){

var table = document.getElementById(myTable);

var existingRow = table.rows[0];

var newRow = table.insertRow(-1); 

for (var k = 0; k < table.rows[0].cells.length; k++) {

var newCell = newRow.insertCell(k);

newCell.rowSpan = existingRow.cells[k].rowSpan;

newCell.colSpan = existingRow.cells[k].colSpan;

newCell.style.cssText = existingRow.cells[k].style.cssText;

}

}