JS中保留小数位数
一、1.2.toFixed(2)
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浮点数进行四舍五入设置指定小数位的数值
二、2.toFixed(2)
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整数尝试,但是在JS中会被认为是对象名,以至于无法使用
三、"1.2".toFixed(2)
aaarticlea/png;base64,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" alt="" />
由于toFixed方法是针对Number类型的,所以string类型的即使能够转换成数字,也不能使用这个方法
四、var a=1;a.toFixed(2);
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构造整数对象,那么就可以调用了
http://www.w3school.com.cn/jsref/jsref_tofixed.asp
下面是w3school中的介绍:
toFixed()这个方法是针对Number 对象(Number 对象是原始数值的包装对象)。
toFixed() 方法可把 Number 四舍五入为指定小数位数的数字。
NumberObject.toFixed(num)
参数 | 描述 |
---|---|
num | 必需。规定小数的位数,是 0 ~ 20 之间的值,包括 0 和 20,有些实现可以支持更大的数值范围。如果省略了该参数,将用 0 代替。 |
返回值
返回 NumberObject 的字符串表示,不采用指数计数法,小数点后有固定的 num 位数字。如果必要,该数字会被舍入,也可以用 0 补足,以便它达到指定的长度。如果 num 大于 le+21,则该方法只调用 NumberObject.toString(),返回采用指数计数法表示的字符串。
抛出
当 num 太小或太大时抛出异常 RangeError。0 ~ 20 之间的值不会引发该异常。有些实现支持更大范围或更小范围内的值。
当调用该方法的对象不是 Number 时抛出 TypeError 异常。
因为需要使用number类型,所以可以将对象转换为number类型。
parseFloat(obj),parseInt(obj)转换都是可以的
还有别的形式,不过实际上主要是string的类型转换
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