javascript increment

In JavaScript, incrementing decrements belong to the unary operator, the so-called unary operator, which is an operator that can manipulate only one value.Increment and decrement operators are available in two versions: pre-and post-built. As the name implies, the predecessor should precede the variable to be manipulated, and the latter should precede the variable to be manipulated.01, pre-type operator use:var age=29; //Equals - equivalent to var ag

The increment operator adds 1 to its operand and returns a numeric value.The increment operator is used in two ways:(1). After use, the operator is behind the operand (such as x + +), then the value is returned before incrementing.(2). Before the operator is in front of the operand (for example, ++x), the value will be returned after incrementing.code example:var x = 1;console.log (x + +); Console.log (×);T

Operator i++ I-- ++i --I Interpretation The first assignment, then the self-increment First assignment, then self-reduction Increment first, then assign value First self-subtraction, post-assignment An expression A = ++i A = i-- A = i++ A = i-- An expression is equivalent to A = i; i = i + 1; A =

Always to self-increment and self-reduction of the order of execution a little confused, today checked the information, to summarizea++ (a--), that is, calculate a, the next time you use this variable to execute + + or--++a (--a) refers to the calculation of + + or--Example 1:var c = 1;var B = (c + +) +c;alert (b);//3At this point, C + + is calculated first, because there is also a C in the expression, so at this point (for the time being C + + as a w

123456789Ten One A - - the + A the +Knowledge Point: CreateElement ("") Create label AppendChild () Add a sub-labelEffects such as:The content is entered by itself in order to demonstrate that the first method sets the Text propertyJavaScript two ways to create labels, implement a click button to make text self-increment

Lt; scripttype quot; text/javascript quot; gt; vara quot; 1 quot; varbfalse; varc quot; dd quot; vard {valueOf: function () {return-1 }}; alert (a ++); // output 1 indicates that the post operator wants to execute the statement using the original

Prefix and suffix of the auto-increment and auto-increment operators, and suffix of the operator prefix. There is such a question in the exam: 12 inta = 4;(++a) += i; Evaluate the value of a. The correct answer is 10. If you think that the focus of this question is only the operator priority, you may easily get the correct answer. However, have you considered why the following code cannot

Tags: style color using AR strong file SP data onMyISAM Data Sheet After you delete the largest numbered record, the number is not reusable. You can use the "auto_increment=n" option to specify a self-increment initial value when building a table. Use the ALTER TABLE TABLE_NAME AUTO_INCREMENT=N command to reset the starting value of the increment. Other: The self-incre