要換列又不要存\n
試試soft合不合用
wrap="soft"

前陣子剛好寫得類似的 這方式只能取小術後幾位

var R = 123456.123456789


(R * 100).toFixed(2);// 12345612.35
R.toFixed(2);// 123456.12

移除小數後的0

function removeTrailingZeros(numberString) {
  return parseFloat(numberString).toString();
}
console.log(removeTrailingZeros("123456789.234000")); //  "123456789.234"
console.log(removeTrailingZeros("123456789.224000")); //  "123456789.224"
console.log(removeTrailingZeros("23456789.2255000")); //  "23456789.2255"

可搭配JavaScript使用

<script>
        /* this function is called when we
              click on the submit button*/
        function numberValidation() {
            event.preventDefault();
            let n = document.form.numbers.value;
 
            if (isNaN(n)) {
                document.getElementById("numberText")
                    .innerHTML = "Please enter Numeric value";
                return false;
            } else {
                document.getElementById("numberText")
                    .innerHTML = "Numeric value is: " + n;
                return true;
            }
        }
    </script>

請參閱 Number validation in JavaScript

總有一天,後世子孫只會叫AI寫程式,然後抄到這篇,產生一個
神奇的輸入元件,然後又被另一個AI抄去....
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