如何统计javascript中用cycle(loop)输入的输入？

Question

他们想要如果你输入像 600 这样的随机数程序打印 "It's made of three digits"，他们想要一个循环并且从 user.We 中获取的输入不能使用 document.write("");抱歉，如果已经存在类似的 post，我找不到我要找的东西 for.Down 我的想法有一部分基本上是输入，按钮和使用 document.getelementbyid 获取输入，并以某种方式用内部 html.Thanks提前！

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title></title>
</head>
<body>


    <p id="result">Hello, please enter a number and the program will show the number of digits
    the number is made of.</p>

    <input id="input1" name="x" placeholder="Enter a number " />

    <button onclick="result()">submit</button>

    <script>
function firstFunction() {
   var input = document.getElementById("input1");
   var result = result();

   document.getElementById("result").innerHTML = ;
   
}

function result(){

//function for the cycle


}
    


    </script>


</body>
</html>

Answer 1

我希望我明白你想要什么，一个告诉别人他们在文本输入中输入了多少数字的功能。我想我做的可能对你需要的东西来说太花哨了，但也许不是。我正在使用 RegEx 来计算输入中的位数，然后将该数字转换为表示它的字符串。如果没有数字，但有字母或特殊字符，则returns为零。它只数到九就停止，但您可以轻松达到所需的高度。

function res() {
  var input = document.getElementById("input1");
 var result = document.getElementById("result");
 var pattern = /[0-9]/g;
 var num = (input.value).match(pattern);
 var str;
 if (!num) {
   str = "zero digits";
 } else {
   switch (num.length) {
     case 0:
      str = "zero digits";
     break;
     case 1:
   str = "one digit";
     break;
     case 2:
      str = "two digits";
   break;
       case 3:
     str = "three digits";
     break;
       case 4:
        str = "four digits";
     break;
       case 5:
     str = "five digits";
     break;
     case 6:
      str = "six digits";
     break;
     case 7:
     str = "seven digits";
      break;
       case 8:
        str = "eight digits";
     break;
     case 9:
   str = "nine digits";
     break;
     default:
        str = "more than nine digits";
     break;
   }
 }
 result.innerHTML = "It's made of " + str + "."
}

<p id="result">Hello, please enter a number and the program will show the number of digits the number is made of.</p>
<input id="input1" name="x" placeholder="Enter a number" />
<button onclick="res()">submit</button>

Answer 2

Get number of digits with JavaScript

已经完成了，之前没看到

function count_digits(n) {
numDigits = 0;
integers = Math.abs(n);

while (integers > 0) {
    integers = (integers - integers % 10) / 10;
    numDigits++;
}
return numDigits;

}

如何统计javascript中用cycle(loop)输入的输入？

How to count the input entered with cycle(loop) in javascript?

javascript

html

loops

cycle