JS in string () and ToString ()

1,. toString ()All of the data can be converted to a string, butexclude null and undefined

For example, to convert false to string type

<script>    var str =  false .toString();    console.log(str,  typeof str); </script>

The returned result is false,string

See if null and undefined can be converted to string JavaScript

<blockquote style= "margin-right: 0px;" dir= "ltr" ><pre  class = "html" name= "code" ><script>    var str =  null .toString();    console.log(str,  typeof str); </script>

Result program Error

<script>    var str = undefined.toString();    console.log(str, typeof str); </script>

Program also error

. toString () parentheses can write a number that represents the binary, corresponding to the binary string

Binary:. toString (2);

Octal:. toString (8);

Decimal:. toString (10);

Hex:. toString (16);

Such as:

var c = 123; Console.log (C.tostring (8)); result 173 2, String ()You can convert null and undefined to a string.

For example, converting null to a string

<script>    var str = String( null );    console.log(str,  typeof str); </script

　　

The returned result is null,string

Convert undefined to a string

<script>    var str = String(undefined);    console.log(str,  typeof str); </script>

The returned result is undefined,string

Console.log (String (077)); Returns the result: 63 (if starting with 0 or starting with 0x will be first converted to a binary number, in a string)

JS in string () and ToString ()