在本文中，我们将学习如何限制HTML输入框，使其仅接受数字输入。
We use the to limit an HTML input box so that it only accepts numeric inputs. By using this, we will get a numeric input field.
Syntax
以下是限制HTML输入框只接受数字输入的语法。
<input type="number">
Example
以下是一个示例程序，用于限制HTML输入框只接受数字输入 -
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<!DOCTYPE html>
<html>
<center>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
input[type=number] {
width: 10%;
padding: 12px 20px;
margin: 8px 0;
box-sizing: border-box;
border: 2px solid mediumseagreen;
border-radius: 4px;
}
</style>
</head>
<body>
<h1>Tutorialspoint</h1>
<form action = "" method = "get">
Enter your Mobile number -
<input type="number"> <br><br>
Enter your area Pincode -
<input type="number"> <br><br>
<input type="submit" value="Submit">
</form>
</body>
</center>
</html>
如果我们尝试输入除数字以外的任何值，它将不允许。因此，它严格只允许数字值。
Example
Following is another example program to limit an HTML input box so that it only accepts numeric input -
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<form action = "" method = "get">
Phone Number:
<input type="number" name="num" min="1" max="20"><br>
<input type="submit" value="Submit">
</form>
</body>
</html>
After limiting the input box to number, if a user enters text and press submit button, then the following can be seen “Please enter a number.”
We can also limit the value of the number input field.
在将输入框限制为数字后，如果用户输入的值大于限制值并点击提交按钮，那么将会显示以下内容：“值必须小于或等于指定的限制值（20）”
Example
Following is another example program to limit an HTML input box so that it only accepts numeric input -
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<form action = "" method = "get">
<h3>Select the quantity, and we cannot deliver more than 5.</h3><br>
Pizza<input type="number" name="num" min="0" max="5"><br>
Burger<input type="number" name="num" min="0" max="5"><br>
Garlic Bread<input type="number" name="num" min="0" max="5"><br>
Pepsi<input type="number" name="num" min="0" max="5"><br>
</form>
</body>
</html>
如果您编译并运行上述代码，它将显示4个方框，您可以将限制设置为从最小值0到最大值5。
