zjzc01:/root/test# cat a3.pl sub mask { my $n=shift; my $j =100; for ($i = 1;$i <= 5;$i++){ print "\$i is $i\n"; while ($n=$n+1) { $j++; print "\$n is $n\n"; if ($n==10){print "\$n---end is $n\n";$n=0;last}; }} }; &mas
return: RETURN Return to invoking function. RETURN causes a return to the invoking function or to the keyboard. It also terminates the KEYBOARD mode. Normally functions return when the end of the function is reached. A RETURN statement can be used to
using System; using System.Collections; namespace YieldDemo { class Program { public static IEnumerable Power(int num, int exponent) { int counter = 0; int result = 1; while (counter++ < exponent) { //if (counter == 4) yield break; if (counter == 4)
this this:的指向在函数定义的时候是确定不了的,只有函数执行的时候才能确定this到底指向谁,实际上this的最终指向的是那个调用它的对象在调用的时候才能决定,谁调用的就指向谁. 情景1:指向window: function a(){ var user = "xx"; console.log(this.user); //undefined console.log(this); //Window } a(); 实际运行: function a(){ var user = &quo
1.return关键字并不是专门用于跳出循环的,return的功能是结束一个方法. 一旦在循环体内执行到一个return语句,return语句将会结束该方法,循环自然也随之结束.与continue和break不同的是,return直接结束整个方法,不管这个return处于多少层循环之内. public class ReturnTest { public static void main(String[] args){ // 一个简单的for循环 for (int i = 0; i < 3 ; i