How to retain two decimal places in numbers

There is a front-end

payload: {
    a: '1.00'
}

Then I converted it: Number (parseFloat (payload. a). toFixed (2)), and the result was payload. a=1, not 1.00 for the number type

i need 
    1.00 => 1.00
    1.01 => 1.01
    1.011 => 1.01
    1.10 => 1.10
all number