我正在使用具有上述格式的字符串，例如“ 5：4”，我需要获取它们的值（例如“ 5：4”等于1.25）。
一个简单的.toDouble()，什么是最好的方法
答案 0 :(得分：1)
您可以<!-- FILE: index.html-->
<!DOCTYPE html>
<html>
<head>
<title>Markdown TexDollar Reader</title>
<!-- Javascript setup using node.js: ->
<!-- C:\demo> npm install mathjax -->
<!-- C:\demo> npm install showdown -->
<script type="text/javascript" src="./node_modules/showdown/dist/showdown.js"></script>
<script type="text/x-mathjax-config">
MathJax.Hub.Config({
tex2jax: {inlineMath: [["$","$"],["\\(","\\)"]]}
});
</script>
<script type="text/javascript"
src="./node_modules/mathjax/MathJax.js?config=TeX-AMS_HTML-full"></script>
</head>
<body>
<script>
converter = new showdown.Converter();
<!-- FIXME: Instead of setting text string manually from javascript,
i want to load my file
in http directory called "markdown.md" into the javascript string text-->
text = '# hello, markdown!';
text += '\nthis is a test';
text += '\n$$e=mc^2$$';
html = converter.makeHtml(text);
document.write(html);
</script>
</body>
</html>
：
Iterable.reduce()答案 1 :(得分：0)
使用String.split()方法的普通Kotlin方法看起来像这样：
// INPUT
val ratio = "5:4" // can be "5/4" as well
// splits given string into a list and then cast it's members into Double
val items : List<Double> = (ratio.split(":", "/")).map { it.toDouble() } // [5, 4]
var result = 0.0
// calculate the ratio
if (items.size == 2 && items[1] != 0.0)
result = items[0] / items[1]
println(result) // 1.25
答案 2 :(得分：-2)
String a="5:4";
a= a.replaceAll(":", "/");
float result = new Expression(a).eval();