On the difference between string () and. ToString () in JS _javascript skill

We know that string () and. ToString () can be converted to string types, but there is a difference between string () and. ToString ().

1. toString () can convert all of the data to a string, but to exclude null and undefined

For example, convert False to String type

<script>
  var str = false.tostring ();
  Console.log (str, typeof str);
</script>

The result returned is false,string

See if null and undefined can be converted to strings

<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>

The program also complains

In the. toString () bracket, you can write a number that represents the system, corresponding to the string

Binary:. toString (2);

Octal system:. toString (8);

Decimal:. toString (10);

Hex:. toString (16);

2, String () can convert null and undefined to strings, but cannot be converted to strings

For example, to convert null to a string

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

The result returned is null,string

Convert undefined to string

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

The result returned is undefined,string

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