Obtaining the length of an integer can be achieved in the following ways:

1. Call the toString method to convert it into a string and get the length.

1

2

defined variable

figure

=

123;

alert(num.toString()。 Length);

2. Take the length after implicitly converting the string.

1

2

defined variable

figure

=

123;

Alarm ((No.

+

'). Length)

The method of 1 is recommended, which is simple and efficient.