[英]I came up with a way to format numbers to scientific notation, how can I call this function whenever I need it?
我剛開始學習 js,到目前為止進展順利。 我遇到了一個問題,標題基本上應該告訴你你需要知道的一切,但不管怎樣,還是來了。
對於我最終想要實現的項目,我需要相當大的數字。 所以我想出了以下方法將它們格式化為科學記數法:
<script>
var rawNumber = 172 ** 25; // The number that shall be formatted into scientific notation
var exponentDisplay = "e+"; // Self explainatory
var numberRelevantDigits = 0; // The digits displayed before the "e+"
var numberExponent = 0; // Self explainatory
var formattedNumberDisplay = 0; // What will be displayed
function formatNumber() { // The function triggered by clicking the button
var numberExponent = Math.floor( Math.log(rawNumber) / Math.log(10) ); // Calculating the exponent of the number in scientific notation
var numberRelevantDigits = rawNumber / 10 ** numberExponent; // Dividing the number by 10 to the power of its exponent
var numberRelevantDigits = numberRelevantDigits.toFixed(3); // Rounds the relevant digits to 3 decimals
var formattedNumberDisplay = numberRelevantDigits + exponentDisplay + numberExponent; // Adding the relevant digits, "e+" and the exponent into a string
document.getElementById("formattedNumberDisplay").innerHTML = formattedNumberDisplay; // Changing the display to the formatted number
}
</script>
這按預期工作,但我不想在需要格式化數字時放置這段代碼。 有沒有一種方法(或者更確切地說:哪種方法)可以做到這一點,這樣我就可以在需要格式化數字時調用它 function? 即使我需要使用不同的變量?
讓我再次道歉,因為這可能已經回答了十幾次,但我什至不知道要尋找什么。
提前謝謝大家。
您的文件 NumberFormater.js 將如下所示:
export formatNumber = (
rawNumber,
exponentDisplay,
numberRelevantDigits,
numberExponent,
formattedNumberDisplay
) => {
let numberExponent = Math.floor( Math.log(rawNumber) / Math.log(10) ); // Calculating the exponent of the number in scientific notation
let numberRelevantDigits = rawNumber / 10 ** numberExponent; // Dividing the number by 10 to the power of its exponent
let numberRelevantDigits = numberRelevantDigits.toFixed(3); // Rounds the relevant digits to 3 decimals
let formattedNumberDisplay = numberRelevantDigits + exponentDisplay + numberExponent; // Adding the relevant digits, "e+" and the exponent into a string
document.getElementById("formattedNumberDisplay").innerHTML = formattedNumberDisplay; // Changing the display to the formatted number
}
然后在需要時:
import { formatNumber } from './NumberFormater.js';
const rawNumber = 172 ** 25; // The number that shall be formatted into scientific notation
const exponentDisplay = "e+"; // Self explainatory
const numberRelevantDigits = 0; // The digits displayed before the "e+"
const numberExponent = 0; // Self explainatory
const formattedNumberDisplay = 0; // What will be displayed
formatNumber( rawNumber, exponentDisplay, numberRelevantDigits, numberExponent, formattedNumberDisplay);
閱讀有關 js 模塊的更多信息https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules希望我有所幫助。
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