is that parseFloat(string).tofixed(2) will cause me a problem?-CodePudding

I have some data like RM 28.51 (Currency), RM30.28(Currency) in my table and need to use these data to do some calculation

my solution is to parseFloat(28.51).tofixed(2) parseFloat(30.28).tofixed(2)

but when the moment more and more data come in , sometimes they will some decimal point error shown as result

Example my result at the end will show 3859.39 but the actual is 3859.40

Is there any better solution?

CodePudding user response：

parseFloat(28.51).toFixed(2) parseFloat(30.28).toFixed(2) - sometimes they will some decimal point error shown as result

The JavaScript toFixed method takes in a number and outputs a string

When you use with two numbers, you add both numbers.

When you use with two strings, you join both strings together.

The example below illustrates the difference.

function addTwoStrings(value1, value2) {
  return parseFloat(value1).toFixed(2)   parseFloat(value2).toFixed(2)
}
function addTwoNumbers(value1, value2) {
  return (parseFloat(value1)   parseFloat(value2)).toFixed(2)
}

console.log(addTwoStrings(28.514, 30.284))
console.log(addTwoNumbers(28.514, 30.284))