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For rounding up your floating point values use Math.round() function. The below will return the value after two decimal places.

Math.round(doc['your_custom_type_var'].value * 100.0)/100.0
If you want to round up after 3 decimal places then change the value as like: 
Math.round(doc['your_custom_type_var'].value * 1000.0)/1000.0
For your case do the followings :
Math.round((doc['cd'].value + 1) * 10.0 - 0.5 )/10.0 // -0.5 for getting the correct result. For this 45.401 and 45.601 both will return 45.6
Notes
Math.round() function returns the closest int to the argument. For example
Math.round(45.40000152) // will return the value 45
Math.round(45.60000152) // will return the value 46
To get the correct answer you can substitute 0.5 to the actual number and then rounding up.Then it will return the value which we want to get.
First we multiple the value with 10.0 for moving the decimal place one unit right(for the above value 454.0000152). After rounding this cuts of the floating point values(for the above value 454), and so we divide the whole numbers by 10.0 for getting the value which rounded up by one decimal place from the actual value(for the above value 45.4).
Think, it will help. 
                Thank for your answer. But cd filed is dynamic value (ex: 44.2, 44.674). So, the value will be wrong when i applying your solution. I want to script_fields that will return to 45.2, 45.674
– Dat Truong
                Oct 6, 2016 at 6:23
                You need to define the decimal point place you want to see. for example 1,2 or three. If you want to make dynamic position set. then use Math.pow(base, power) in the place of 10.0. Give feedback if any query
– sunkuet02
                Oct 6, 2016 at 6:45
        
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