javascript中的双值

Question

示例示例：

var amount = 100; 
alert(amount);  // output: 100

如何获得100.0的输出？

Answer 1

使用.toFixed(int)：

var amount = 100;
document.querySelector('pre').innerHTML = parseFloat(amount).toFixed(1);

<pre></pre>

Answer 2

var amount = 100;
alert(amount);  // output: 100
alert(amount.toFixed(1));  // output: 100.0
alert(amount.toFixed(2));  // output: 100.00
alert(amount.toFixed(3));  // output: 100.000

https://www.w3schools.com/jsref/jsref_tofixed.asp

**number.toFixed(x)**

其中number是您要转换为double的值，X是您要设置的精度。

Answer 3

var amount = 100;
alert(amount.toFixed(1));  // output: 100.0
alert(amount.toFixed(2));  // output: 100.00
alert(amount.toFixed(3));  // output: 100.000