//var a = -1.1230000;  
    //var a = 0.0000009999999;  
    //var a = 1.000000000;  
    //var a = -4.55555;  
    //var a = 5.0001000;  
    var a = 1.1234000;  
      
      
    var result = parseFloat(a.toFixed(4));  
    console.log(result);