JavaScript in-process conversion

I. Explanation of grammar 1, parseint ()

parseint: Converting a string to an integer

parseint (string, radix)

• String to be parsed.

• Optional. Represents the cardinality of the number to parse. The value is between 2 and 36.

  If this argument is omitted or its value is 0, the number is parsed based on 10.
  If it starts with "0x" or "0X", it will have a base of 16.

  If the parameter is less than 2 or greater than 36, parseint () returns NaN.

2. ToString ()

The ToString () method belongs to the Object object, and many of the built-in objects of JavaScript rewrite the function to make it more suitable for its own functional needs.

type	Behavior Description
Array	Converts each element of the Array to a string and joins them in turn, stitching together two elements with commas as delimiters.
Boolean	Returns "true" if the Boolean value is true. Otherwise, "false" is returned.
Date	Returns the text representation of the date.
Error	Returns a string containing the associated error information.
Function	Returns a string of the following format, where functionname is the name of a function, and the toString method of this function is called: "function functionname () {[native code]}"
Number	Returns a string representation of a numeric value. You can also return a string specified as a binary representation, refer to number.tostring ().
String	Returns the value of a String object.
Object (default)	Returns "[Object ObjectName]", where ObjectName is the name of the object type.

2. Binary conversion

//decimal to other binaryvarx=110;  alert (x); Alert (x.tostring (2)); Alert (x.tostring (8)); Alert (x.tostring (32)); Alert (x.tostring (16)); //Other Turn decimalvarx= ' 110 '; Alert (parseint (x,2));//6 = 2 binary parsingAlert (parseint (x,8));//the 8 binary analysisAlert (parseint (x,16));//272 = with 16 binary parsing//other transfer to other//use parseint to convert to decimal before using ToString to go to target systemAlert (String.fromCharCode (parseint (141,8)) alert (parseint ("FF", +). ToString (2));

Third, test questions

Write a function that takes an (unsigned) integer as input, and returns the number of bits that is equal to one in the BI Nary representation of that number.

Example: The binary representation 1234 10011010010 of IS, so the function should return in this case 5

<script>    function  countbits (n) {        var resultstring = n.tostring (2);         var l = resultstring.length;         var resultnum = 0;          for (var i = 0; i < l; i++) {            + = resultstring[i]-0;        }        Console.log (resultnum);         return resultnum;    }    Func (1234);     </script>

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JavaScript in-process conversion