var columns=[
[
{field:"itemid",title:"Item ID"},
{field:"productid",title:"Product ID"},
{title:"Item Details"}
]
]
var property={rowspan:2,width:80,sortable:true} //
//for
for(var i=0;i<columns[0].length;iPP){
for(var key in property){
columns[0][i][key]=property[key]
}
}because key of type columns [I] is array, array cannot be a string
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