Javascript 如何获得数字的最后一位

How to get Last digit of number

提问by Kashyap Patel

How to extract last(end) digit of the Number value using jquery. because i have to check the last digit of number is 0 or 5. so how to get last digit after decimal point

如何使用 jquery 提取 Number 值的最后（结束）数字。因为我必须检查数字的最后一位数字是 0 还是 5。所以如何获得小数点后的最后一位数字

For Ex. var test = 2354.55Now how to get 5 from this numeric value using jquery. i tried substrbut that is only work for string not for Number format

对于前。 var test = 2354.55现在如何使用 jquery 从这个数值中得到 5。我试过substr但这仅适用于字符串而不适用于数字格式

Like if i am use var test = "2354.55";

就像我在用 var test = "2354.55";

then it will work but if i use var test = 2354.55then it will not.

那么它会起作用，但如果我使用var test = 2354.55它就不会。

回答by Jai

Try this one:

试试这个：

var test = 2354.55;
var lastone = +test.toString().split('').pop();

console.log("lastone-->", lastone, "<--typeof", typeof lastone);

// with es6 tagged template and es6 spread
let getLastDigit = (str, num)=>{
  return num.toString();
};
let test2 = 2354.55;
let lastone2 = +[...getLastDigit`${test2}`].pop();

console.log("lastone2-->", lastone2, "<--typeof", typeof lastone2);

---

---

Updates with ES6/ES2015:

ES6/ES2015 更新：

We can use tagged template in such case as numbers are not iterable. So, we need to convert the number to a string representation of it. Then just spread it and get the last number popped.

在数字不可迭代的情况下，我们可以使用标记模板。因此，我们需要将数字转换为它的字符串表示形式。然后只需传播它并弹出最后一个数字。

回答by xameeramir

This worked for us:

这对我们有用：

var sampleNumber = 123456789,
  lastDigit = sampleNumber % 10;
console.log('The last digit of ', sampleNumber, ' is ', lastDigit);

Works for decimals:

适用于小数：

var sampleNumber = 12345678.89,
  lastDigit = Number.isInteger(sampleNumber) ? sampleNumber % 10
    : sampleNumber.toString().slice(-1);
console.log('The last digit of ', sampleNumber, ' is ', lastDigit);

Click on Run code snippet to verify.

单击运行代码片段进行验证。

回答by Mritunjay

you can just convert to string

你可以只转换为字符串

var toText = test.toString(); //convert to string
var lastChar = toText.slice(-1); //gets last character
var lastDigit = +(lastChar); //convert last character to number

console.log(lastDigit); //5

回答by lshettyl

Here is another one using .slice():

这是另一个使用.slice()：

var test = 2354.55;
var lastDigit = test.toString().slice(-1);
//OR
//var lastDigit = (test + '').slice(-1);

alert(lastDigit);

回答by dave

If you want the digit in the hundredths place, then you can do the following:

如果您想要百分位的数字，那么您可以执行以下操作：

test * 100 % 10

The problem with convert to string and getting the last digit is that it does not give the hundredths place value for whole numbers.

转换为字符串并获取最后一位数字的问题在于它没有给出整数的百分位值。

回答by RRK

toString()converts number to string, and charAt()gives you the character at a particular position.

toString()将数字转换为字符串，并charAt()为您提供特定位置的字符。

var str = 3232.43;
lastnum = str.toString().charAt( str.length - 1 );
alert( lastnum );

回答by joyBlanks

There is a JS function .charAt()you can use that to find the last digit

有一个 JS 函数，.charAt()您可以使用它来查找最后一位数字

var num = 23.56
var str = num.toString();
var lastDigit = str.charAt(str.length-1);
alert(lastDigit);