about table column with

I chose a table cell the column width

regular increase a command can be written

I tried to do, but did not

var myStep = 1; 
var myTables = app.selection[0].stories[0].tables[0].everyItem().getElements(); 
for(var n=0;n<myTables.length;n++){ 
 for (i=0; i<myTable.columns.length; i++)    if(myTables [n].columns[i].width + myStep<0){myTables [n].columns[i].width= 0; continue};     myTables [n].columns[i].width = myTables [n].columns[i].width + myStep;