JS number converted to float, take n decimal _javascript Tips

JS number converted to float, take n decimal:

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The variables in JavaScript are weak types, all variables are declared Var, and are not as convenient as Java in the type conversion process, which is done by means of parseint (variables), parsefloat (variables), and so on. Note: There is no parsedouble (variable) for this type conversion, because in JavaScript there is no single precision float and double doubles, and all variables with decimals are considered float, so the n bit after the decimal number is taken, You want to use the method tofixed (n) to get it.

For example:
var f=2.56556;
F.tofixed (2);

It is preferable to 2 digits after the variable F decimal, and if it is not a float, a type conversion (parsefloat (variable name)) is required to be obtained by this method.