如何在JavaScript中合并数组

var newCells = [];for (var i = 0; i < totalCells.length; i++) {    var lineNumber = totalCells[i].lineNumber;    if (!newCells[lineNumber]) { // Add new object to result        newCells[lineNumber] = { lineNumber: lineNumber, cellWidth: []        };    }    // Add this cellWidth to object    newcells[lineNumber].cellWidth.push(totalCells[i].cellWidth);}