document.write("13: " + Number.isInteger(13) + "<br />"); //true
document.write("0: " + Number.isInteger(0) + "<br />"); //true
document.write("-15: " + Number.isInteger(-15) + "<br />"); //true
document.write("150/5: " + Number.isInteger(150/5) + "<br />"); //true
document.write("-3.14: " + Number.isInteger(-3.14) + "<br />"); //false
document.write("'19': " + Number.isInteger('19') + "<br />"); //false
document.write("\"19\": " + Number.isInteger("19") + "<br />"); //false
document.write("'abc': " + Number.isInteger('abc') + "<br />"); //false
document.write("Infinity: " + Number.isInteger(Infinity) + "<br />"); //false
document.write("-Infinity: " + Number.isInteger(-Infinity) + "<br />"); //false
document.write("5/0: " + Number.isInteger(5/0) + "<br />"); //false
document.write("2017/4/14: " + Number.isInteger(2017/4/14) + "<br />"); //true
/*
run:
13: true
0: true
-15: true
150/5: true
-3.14: false
'19': false
"19": false
'abc': false
Infinity: false
-Infinity: false
5/0: false
2017/4/14: false
*/
