tailieunhanh - Flash: ActionScript Language Reference- P4

Tham khảo tài liệu 'flash: actionscript language reference- p4', công nghệ thông tin, đồ họa - thiết kế - flash phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | for Availability Flash Player 5. Usage for init condition next statement s Parameters init An expression to evaluate before beginning the looping sequence usually an assignment expression. A var statement is also permitted for this parameter. condition An expression that evaluates to true or false. The condition is evaluated before each loop iteration the loop exits when the condition evaluates to false. next An expression to evaluate after each loop iteration usually an assignment expression using the increment or decrement -- operators. statemen t s An instruction or instructions to execute within the body of the loop. Description Statement evaluates the init initialize expression once and then starts a looping sequence. The looping sequence begins by evaluating the condition expression. If the condition expression evaluates to true statement is executed and the next expression is evaluated. The looping sequence then begins again with the evaluation of the condition expression. The curly braces used to enclose the block of statements to be executed by the for statement are not necessary if only one statement will execute. Example The following example uses for to add the elements in an array var my_array Array new Array for var i Number 0 i 10 i my_array i i 5 10 trace my_array i trace my_array output 50 60 70 80 90 100 110 120 130 140 The following example uses for to perform the same action repeatedly. In the code the for loop adds the numbers from 1 to 100. var sum Number 0 for var i Number 1 i 100 i sum i trace sum output 5050 for 301 The following example shows that curly braces are not necessary if only one statement will execute var sum Number 0 for var i Number 1 i 100 i sum i trace sum output 5050 See also increment -- decrement var while do while 302 Chapter 2 ActionScript Language Reference Availability Flash Player 5. Usage for variablelterant in object statement s Parameters variablelterant The name of a variable to act as the iterant .