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RangeError: precision is out of range

描述

RangeError: precision {0} out of range (Firefox)
RangeError: toExponential() argument must be between 0 and 20 (Chrome)
RangeError: toFixed() digits argument must be between 0 and 20 (Chrome)
RangeError: toPrecision() argument must be between 1 and 21 (Chrome)

错误类型

RangeError

什么地方出错了?

以下的某个方法传入了一个超出精度范围的参数:

通常这些方法允许的参数范围介于0和20(或21)之间。需要注意的是,ECMAScript标准是允许扩展这个范围的。

Method Firefox (SpiderMonkey) Chrome, Opera (V8)
Number.prototype.toExponential() 0 to 100 0 to 20
Number.prototype.toFixed() -20 to 100 0 to 20
Number.prototype.toPrecision() 1 to 100 1 to 21

示例

错误的示例

77.1234.toExponential(-1);  // RangeError
77.1234.toExponential(101); // RangeError

2.34.toFixed(-100);         // RangeError 
2.34.toFixed(1001);         // RangeError 

1234.5.toPrecision(-1);     // RangeError
1234.5.toPrecision(101);    // RangeError

正确的示例

77.1234.toExponential(4); // 7.7123e+1
77.1234.toExponential(2); // 7.71e+1

2.34.toFixed(1); // 2.3
2.35.toFixed(1); // 2.4 (note that it rounds up in this case)

5.123456.toPrecision(5); // 5.1235
5.123456.toPrecision(2); // 5.1
5.123456.toPrecision(1); // 5

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