js instructions for formatting numbers_javascript skills-JS Tutorial-php.cn

js instructions for formatting numbers_javascript skills

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Release： 2016-05-16 18:12:03

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Javascript is also provided Support for formatted output of numbers

Several formatting functions provided by the Number object:

toExponential([fractionDigits]): Return the number in scientific notation format, in which fractionDigits The number of digits after the decimal point of the value.
toFixed([fractionDigits]): Returns the number with the specified number of decimal places, where fractionDigits is the number of digits left after the decimal point.
toPrecision([precision]): Return the number to the specified precision (this precision does not refer to the number of decimal places), where precision is the specified precision value.

var num=56.45678;
var rs1=num.toExponential(2);//The value of rs1 is 5.65e 1
var rs2=num.toFixed(2);//The value of rs The value is 56.45
var rs3=num.toPrecision(2);//The value of rs is 56

Although the methods provided by the Number object can solve many number conversions problem, but it is still not satisfactory for many situations, such as support for percent signs and so on.

In order to solve this problem and provide more powerful and flexible digital formatting requirements, JsJava specifically provides Javascript custom classes for support. You can download jsjava-1.0. js, reference src/jsjava/text/NumberFormat.js or directly reference jslib/jsjava-1.0.js, for example: