Add-ins

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Excel.run ( async (context) => { 
    let sheet1 = context.workbook.worksheets.getActiveWorksheet(); 
    let range1 = sheet1.getRange("A1:B6"); 
    let mynumbers = [ [5, 10], [15, 20], [25, 30], [35, 40], [45, 50], [55, 60] ]; 
    range1.values = mynumbers; 
    let range2 = sheet1.getRange("A1:B2"); 
    range2.load('values');  
    let range3 = await context.sync(range2); 

    let cellvalue1 = range3.values[0][0]; 
    console.log(cellvalue1); 
    let range4 = sheet.getRange("A3:B4"); 
    range4.load('values');  
    let range5 = await context.sync(range4); 

    let cellvalue2 = range5.values[0][0]; 
    console.log(cellvalue2); 
    let range6 = sheet1.getRange("A5:B6"); 
    range6.load('values');  
    let range7 = await context.sync(range6); 

    let cellvalue3 = range7.values[0][0]; 
    console.log(cellvalue3); 
    await context.sync(); 
}).then( () => { console.log("Finished"); 
}).catch( (error) => { console.log(error); 
});