JavaScript 和 HTML 中数字所有数字的总和
[英]sum of all digits of a number in JavaScript and HTML
问题描述
I wanted to write a program that calculates the sum of all digits of a number.
我想编写一个程序来计算一个数字的所有数字之和。 I saw similar posts but none of them were written in JavaScript inside HTML.我看到过类似的帖子，但没有一个是在 HTML 中用 JavaScript 编写的。 I am not getting any output, the webpage is entirely blank.我没有得到任何输出，网页完全空白。
<!DOCTYPE html>
<html>
<head>
<title>sample</title>
</head>
<body>
<p id ="demo"></p>
<script>
n=prompt("enter a number");
function adddigits(n)
{
s=0;
while(n!=0)
{
s=s+n%10;
n=n/10;
}
document.getElementById("demo").innerHTML = "sum of the digits" + s ;
}
</script>
</body>
</html>
3 个解决方案
解决方案1
2 2017-01-25 08:47:39
program that calculates the sum of all digits of a number
The right way:正确的方式：
n = prompt("enter a number"); function getSum(n) { if (!/^\\d+$/.test(n)) { // check for non-digit input throw new Error('Wrong number: ' + n); } // converting each digit from text representation into number // and getting sum of them var sum = n.split('').map(Number).reduce(function(a,b) { return a + b; }); document.getElementById("demo").innerHTML = "sum of the digits: " + sum ; } getSum(n); // calling function to calculate the sum of numbers
<p id ="demo"></p>
解决方案2
0 2017-01-25 08:43:54
You are not calling your function anyway.无论如何你都没有调用你的函数。 You can do that by adding follwing code to your :您可以通过将以下代码添加到您的：
$( document ).ready(function() {
var n=prompt("enter a number");
adddigits(n);
});
解决方案3
0 2017-01-25 08:48:48
You forgot to remove the trailing part of the rest of the division, eg n=n/10 becomes n=Math.floor(n/10) .您忘记删除除法其余部分的尾随部分，例如n=n/10变为n=Math.floor(n/10) 。
var n = prompt("enter a number"); adddigits(n); function adddigits(n) { var s = 0; while (n != 0) { s = s + n % 10; n = Math.floor(n / 10); } alert(s); }
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