检查数字是否有小数位/是否为整数
我正在寻找一种在 JavaScript 中检查数字是否有小数位的简单方法(以确定它是否为整数).例如，
I am looking for an easy way in JavaScript to check if a number has a decimal place in it (in order to determine if it is an integer). For instance,
23 -> OK
5 -> OK
3.5 -> not OK
34.345 -> not OK
if(number is integer) {...}推荐答案
使用 modulus 会起作用:
num % 1 != 0
// 23 % 1 = 0
// 23.5 % 1 = 0.5
<小时>
请注意，这是基于数字的数值值，与格式无关.它将包含带有固定小数点的整数的数字字符串视为整数:
Note that this is based on the numerical value of the number, regardless of format. It treats numerical strings containing whole numbers with a fixed decimal point the same as integers:
'10.0' % 1; // returns 0
10 % 1; // returns 0
'10.5' % 1; // returns 0.5
10.5 % 1; // returns 0.5
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