JS number converted to float, take n decimal

In JavaScript, no single precision float and double doubles, all the decimal variables are considered float, so to take the decimal number of n, to use the method tofixed (n) to get

JS number converted to float, take n decimal: ========================================= JavaScript variables are weak types, all variables are declared Var, In the type conversion process is not as convenient as Java, it is through parseint (variables), parsefloat (variables) and other methods to convert the type.    Note: There is no parsedouble (variable) This type conversion, because in JavaScript without a single precision float and double doubles, everything has a decimal variable is considered float, so to take the number of n digits after the decimal, to use the method tofixed (n) to get.      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.