JavaScript self-increment, decrement operator

JavaScript self-increment, decrement operator, and expression syntax

vari++;

• var--Declaring variables
• i--Variable name
• ++--Self-increment operator

JavaScript self-increment, decrement operator and expression

JavaScript self-increment, decrement operator and expression (I initial value is 6)

Operator	++i	--i	i++	i--
Name	Pre-increment operator	Pre-decrement operator	Post-increment operator	Post-decrement operator
An expression	++i	-I.	i++	i--
Example	++i;	I.;	i++;	i--;
Results of I	7	5	7	5
An interesting example	++i Alert (i) Alert (++i) Alert (i)	-I. Alert (i) Alert (-I.) Alert (i)	i++ Alert (i) Alert (i++) Alert (i)	i-- Alert (i) Alert (i--) Alert (i)
Results	7 8 8	5 4 4	7 7 8	5 5 4

Example explanation

The pre-increment operator is essentially different from the post-increment operator, where the same point is 1 for itself, and the difference is that the former increment operator is preceded by 1, then the operand value, and the increment operator is the value of the operand first, plus 1. For example:

var a;var i=6;//(前加加)i加1后，i等于7，并将i值赋予a，于是a等于7a=++i;document.write(i);document.write(a);i=6;//(后加加)将i值赋予a，于是a等于6，最后i加1，i等于7a=i++;document.write(i);document.write(a);

Results

7776
Original link: http://www.cnblogs.com/leejersey/archive/2011/12/12/2284468.html

JavaScript self-increment, decrement operator