There are some mistakes in your code. Please correct it.
function EstiloEtiquetas(value, rowData, index){
return 'background-color:#F0F0F0';
}
columns: [[
{field:'name',title:'',width:200,resizable:false,formatter:FormateaEtiqueta,styler:EstiloEtiquetas},
{field:'value',title:'',width:400,resizable:false,formatter:FormateaValor}
]]