What is the javascript string conversion function?

javascript string conversion function: 1. toString() function, which can convert all data into strings, the syntax is "number.toString(radix)"; 2. String() function, which can convert objects The value is converted to a string with the syntax "String(js object)".

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

JavaScript string conversion function - String() and toString()

1, .toString() All data can be converted into strings, but null and undefined

must be excluded. For example, 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 into strings javascript

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

As a result, the program reports an error

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

Program Also reported an error

.toString() You can write a number in the brackets, representing the base, corresponding to the base string

Binary: .toString(2);

Octal: .toString(8);

Decimal: .toString(10);

Hexadecimal: .toString(16);

For example:

var c = 123 ;
console.log(c.toString(8));

The result is

173

2, String() can convert null and undefined into strings.

For example, convert 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>

Return The result is undefined, string

console.log(String(077));

returns the result: 63 (if it starts with 0 or 0x, it will be converted to a base number first, and then converted to a string)

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