如何在 html 输入中同时支持逗号和点，并在按键事件上使用 javascript 将小数位固定为 2 位并使用空格作为千位分隔符。
如果您从键盘输入，而不是剪贴板粘贴：
<!DOCTYPE html>
<html>
<head>
<title>Input Field with Comma and Dot Support</title>
</head>
<body>
<label for="myInput">Enter a number:</label>
<input type="text" id="myInput">
<script>
document.getElementById("myInput").addEventListener("input", function(event) {
// Get input value
let input = event.target.value;
// Remove all non-numeric characters except decimal point
input = input.replace(/[^\d.]/g, '');
// Only allow one decimal point
let decimalIndex = input.indexOf('.');
if (decimalIndex !== -1) {
input = input.substr(0, decimalIndex + 1) + input.substr(decimalIndex + 1).replace(/\./g, '');
// Limit to two decimal places
input = input.substr(0, decimalIndex + 3);
}
// Insert comma after every third digit from the end
input = input.replace(/\B(?=(\d{3})+(?!\d))/g, ",");
// Update input value
event.target.value = input;
});
</script>
<p>With this code, you should be able to input 185656.56 and have it formatted as 1,856,56.56</p>
</body>
</html>如果您从剪贴板粘贴输入：
<input type="text" id="myInput" oninput="formatNumber()" />
<script>
function formatNumber() {
// Get the current value of the input field
const input = document.getElementById("myInput");
let value = input.value;
// Check if the value is empty or not a number
if (value === "" || isNaN(parseFloat(value))) {
// If so, set the value to 0
value = "0";
}
// Replace commas with periods
value = value.replace(/,/g, ".");
// Parse the numeric value
let number = parseFloat(value);
// Format the number with a space as a thousand separator and two decimal places
value = number.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
// Update the input field with the formatted value
input.value = value;
}
</script>