如何在逗号后用3位数字解析浮点数？

Question

我有浮点数

var distance = 3.643462215; 

我想要的结果是这样的：

我的距离是3公里，643米

Answer 1

让我们假设distance是肯定的浮动 - 如果是字符串，请执行：distance = parseFloat(distance)

您可以尝试与：

distance.toFixed(3); 

它给你3.643;

distance.toFixed(3).split('.'); 

它返回：你可以用它拆分分隔值

["3", "643"] 

所以得到它运行：

var distance = 3.643462215, 
    parts = distance.toFixed(3).split('.'), 
    output = 'my distance is ' + parts[0] + ' kilometers and ' + parts[1] + ' meters'; 

输出：

"my distance is 3 kilometers and 643 meters" 

Answer 2

Math.round(distance * 1000)/1000 

Answer 3

var distance = 3.643462215; 

var reg = /(\d*)\.(\d{0,3})/; // using reg exp, because split won't work with float numbers 

var res = reg.exec(distance); 

console.log(res[1] + " Kilometers, " + res[2] + " Meters"); // 3 Kilometers, 643 Meters 

在剧本我（.之前和之后）的两件与RegExp帮助分裂数，然后用结果操纵存储在res可变

JSFiddle

Answer 4

var distance = 3.643462215; 

var n = Math.floor(distance); // KM part 

var m = Math.round((distance-n) * 1000); // meter part 

Answer 5

简单的解决方案我可以建议是

<script type="text/javascript"> 
var distance = 3.643462215; 
var strDistance = distance.toString(); 

var km = strDistance.substr(0, strDistance.indexOf('.')); 
var mt = strDistance.substr(strDistance.indexOf('.')+1, 3); 

alert("my distance is "+km+" kilometers and "+mt+" meters"); 
</script>