、1.2.toFixed(2)

aaarticlea/png;base64,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" alt="" />

浮点数进行四舍五入设置指定小数位的数值

、2.toFixed(2)

aaarticlea/png;base64,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" alt="" />

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);

aaarticlea/png;base64,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" alt="" />

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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