限制在小数点后面显示的数字的数量 [英] Limit the amount of number shown after a decimal place in javascript

问题描述

干草，我有一些像这样的花车

  4.3455 
 2.768 
 3.67 
  

我想以这样的方式显示它们

  4.34 
 2.76 
 3.67 
  

要把数字向上或向下舍入，只需将小数点后面显示的数字量限制为2。正在寻找 toFixed ：

  var x = 4.3455; 
 alert（x.toFixed（2））; //警报4.35  - 不是你想要的！ 
  

...但是看起来像是要截断而不是舍入，所以：

  var x = 4.3455; 
 x = Math.floor（x * 100）/ 100; 
 alert（x.toFixed（2））; // alert 4.34 
  

Hay, i have some floats like these

4.3455
2.768
3.67

and i want to display them like this

4.34
2.76
3.67

I don't want to round the number up or down, just limit the amount of numbers shown after the decimal place to 2.

解决方案

You're looking for toFixed:

var x = 4.3455;
alert(x.toFixed(2)); // alerts 4.35 -- not what you wanted!

...but it looks like you want to truncate rather than rounding, so:

var x = 4.3455;
x = Math.floor(x * 100) / 100;
alert(x.toFixed(2)); // alerts 4.34

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