问题
Using Javascript:
How I can convert one number integer to Double Number Example:
100 -> 100.00
回答1:
All numbers in JavaScript are doubles: that is, they are stored as 64-bit IEEE-754 doubles.
That is, the goal is not to get a "double": the goal is to get the string reprsentation of a number formatted as "YYY.XX". For that, consider Number.toFixed, for instance:
(100).toFixed(2)
The result is the string (not a "double"!) "100.00". The parenthesis are required to avoid a grammar ambiguity in this case (it could also have been written as 100.0.toFixed or 100..toFixed), but would not be required if 100 was in a variable.
Happy coding.
回答2:
JavaScript numbers are already IEEE 754 floating point numbers (specification). If you want to format it (for output), you can use toFixed [MDN].
回答3:
All numbers are stored as doubles in javascript.
回答4:
All numbers are stored as doubles in javascript. You can use toFixed if you want specific decimal points after the number
来源：https://stackoverflow.com/questions/7312693/how-to-convert-int-number-to-double-number