About the difference between String() and .toString() in JS (combined with the code, it is clear at a glance)

The following is the difference between String() and .toString() in JS that I have compiled for you. Interested students can take a look.

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

1. .toString() can convert all data 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 result returned is false, string

See if null and undefined can be converted into strings

<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>

The program also reports 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);

2. String() can convert null and undefined into strings, but there is no way Convert to hexadecimal string

For example, convert null to string

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

The returned result is null, string

Convert undefined to string

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

The returned result is undefined, string

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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