像this一样？

// Create a dataSource variable  

let dataSource = [
    {
        startDate: new Date(2019,1,4),endDate: new Date(2019,15),color: "yellow"
    },{
        startDate: new Date(2019,3,5),5,color: "yellow"
    }
]

// Create the calendar with the dataSource

let calendar = new Calendar('#calendar',{
    style: 'background',dataSource: dataSource,enableRangeSelection: true
});


document.querySelector('#calendar').addEventListener('selectRange',function(e) {
    // Append the new data to dataSource 
    dataSource.push({
        startDate: e.startDate,endDate: e.endDate,color: "red"
    })

    // Set the updated dataSource as main source
    calendar.setDataSource(dataSource)
});