JavaScript method to convert data into integers_javascript skills

JavaScript provides the method parseInt to convert a numerical value into an integer, which is used to convert the string data "123" or the floating point number 1.23.

Copy code The code is as follows:

parseInt("1"); // 1
parseInt("1.2"); // 1
parseInt("-1.2"); // -1
parseInt(1.2); // 1
parseInt(0); // 0
parseInt("0"); // 0

But this parseInt function is not always valid:

Copy code The code is as follows:

parseInt ('06'); // 6
parseInt('08'); // 0 Note that the new Google version has been corrected
parseInt("1g"); // 1
parseInt("g1") ; // NaN

To do this, I wrote a function to convert arbitrary data into integers.

Copy code The code is as follows:

function toInt(number) {
return number* 1 | 0 || 0;
}

//test
toInt("1"); // 1
toInt("1.2"); // 1
toInt ("-1.2"); // -1
toInt(1.2); // 1
toInt(0); // 0
toInt("0"); // 0
toInt (Number.NaN); // 0
toInt(1/0); // 0

There are also conversion functions written by netizens. They are also written down for reference. They are also suitable for converting data Convert to integer.

Copy code The code is as follows:

function toInt(number) {
return number && number | 0 || 0;
}

Note that the valid range of integers that the above two functions js can represent is -1569325056 ~ 1569325056

In order to express a larger range of values ​​in js, I also wrote a function for reference, as follows:

Copy code The code is as follows:

function toInt(number) {
return Infinity === number ? 0 : (number*1 || 0).toFixed(0)*1;
}