JavaScript method sharing for judging integers_javascript skills

var r = /^ ?[1-9][0-9]*$/; //Positive integer
console.log(r.test(1.23));

"^\d $"　 //Non-negative integer (positive integer 0)
"^[0-9]*[1-9][0-9]*$" //Positive integer
"^((-\d )|(0 ))$" //Non-positive integer (negative integer 0)
"^-[0-9]*[1-9][0-9]*$" // Negative integer
"^-?\d $"　　 //Integer
"^\d (\.\d )?$" //Non-negative floating point number (positive floating point number 0)
"^(([0-9] \.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\. [0-9] )|([0-9]*[1-9][0-9]*))$" //Positive floating point number
"^((-\d (\.\d )?)|(0 (\.0 )?))$" //Non-positive floating point number (negative floating point number 0)
"^(-(([0-9] \.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]* \.[0-9] )|([0-9]*[1-9][0-9]*)))$" //Negative floating point number
"^(-?\d )(\.\d )?$" //Floating point number

var num=1.23;
if (parseInt(num) != num) {
console.log(num "is a non-integer");
}
else{
console.log(num "is an integer");
}