javascript中匹配的float和string值不匹配

Question

I am using this code

if(total == balance)
{
alert("test ok");
}
else
{
alert("test failed");
}

here total=10; and balance=10.00; but the result is "test failed".

Answer 1

Hmm... I may not be exactly correct, but I think total is taken as an integer and balance is taken as a decimal. Try the === function instead of the == function.

The === function converts the values and then checks them. So checking if a value is true or false depending on whether it is 0 or 1 requires the === operator to convert both into the same type of values.

And the == function just checks whether two values are equal, just by looking at the present value of it. No conversion. So if I want to check the values of two int values, I will use == .

There are two ways to solve this problem.

One is by changing either the total into a decimal, by giving it a value of 10.00 with a decimal or changing the balance into an int by giving it a value of 10, without the decimal places.

The other is the better one, and you just have to replace your == with a === . So your code would look like this:

if (total === balance) {
    window.alert("test ok");
} else {
    window.alert("test failed");
}