Newb问题：我在脚本中使用decimal.js遇到了麻烦

Question

I'm very new to JavaScript, and am trying to use decimal.js, for a project that requires its fractional exponents. 我对JavaScript还是很陌生，并且正在尝试将小数.js用于需要其小数指数的项目。

I've been trying every variation that I see in examples, but my variable declarations are failing, causing the script to abort. 我一直在尝试在示例中看到的每个变体，但是我的变量声明失败，导致脚本中止。 The result is a blank document. 结果是空白文档。

I've stripped the script down, to include just what I think will be needed for this question. 我已经精简了脚本，以包括我认为该问题所需的内容。

<HTML>
<HEAD>
<TITLE>My First Script</TITLE>
<script src="http://mikemcl.github.io/decimal.js"></script>
<!--
<script src="https://unpkg.com/mathjs/dist/math.js"></script>
-->

<HR>
<H1>Title</H1>
<HR>
</HEAD>

<BODY>
<SCRIPT LANGUAGE="JavaScript"> <!--
function myFunction(parm) {
    var Decimal         = require('decimal.js')
    Decimal.set({precision: 200});
    var dn              = new Decimal(parm)

    document.write(dn)
}

myFunction(123.456789)

// --> </SCRIPT>
</BODY>
</HTML>

Answer 1

I've only used decimal.js before as an npm package, not as a script loaded directly into a browswer, but require('decimal.js') is not how you'd load this script in a browser, and you definitely wouldn't want to load it over and over again each time your function is called . 我之前仅将decimal.js用作npm软件包，而不是将脚本直接加载到浏览器中，但是require('decimal.js')并不是您如何在浏览器中加载此脚本，并且您绝对不会不想每次调用函数时都一遍又一遍地加载它。

Try just taking this line out: var Decimal = require('decimal.js') , and see how far you get. 尝试仅删除这一行： var Decimal = require('decimal.js') ，然后看看能走多远。 Decimal should already be defined as a global variable by loading the script. 通过加载脚本， Decimal应该已经定义为全局变量。

Also, if you want to get the full precision 'decimal.js' offers, initialize value with string values, not numeric values, like this: 另外，如果您想获得全精度的“ decimal.js”产品，请使用字符串值而不是数字值来初始化值，如下所示：

myFunction('123.456789')

Otherwise you'll never get any more precision than a regular JavaScript number provides. 否则，您将永远无法获得比常规JavaScript number提供的精度更高的精度。

Newb问题：我在脚本中使用decimal.js遇到了麻烦

问题描述

1 个解决方案

解决方案1
0 2019-09-02 03:54:21

Newb问题：我在脚本中使用decimal.js遇到了麻烦

问题描述

1 个解决方案

解决方案1 0 2019-09-02 03:54:21

解决方案1
0 2019-09-02 03:54:21