1.break：立即退出循环
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>break和continue语句</title> </head> <body> <h2>break：立即退出循环</h2> <script type="text/javascript"> var num = 0; for (var i = 1; i < 15; i++) { //如果i是6的倍数，退出 if(i %6 == 0){ break; } // console.log(i); //1,2,3,4,5 num++; //i=1,num=1;i=2,num=2;i=3,num=3,i=4,num=4,i=5,num=5 } console.log(num);//5 </script> </body> </html>
2.continue语句：结束本次循环，继续开始下一次
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>break和continue语句</title> </head> <body> <h2>continue：结束本次循环，继续开始下一次</h2> <script type="text/javascript"> var num = 0; for (var i = 1; i < 15; i++) { //如果i是6的倍数 if(i %6 == 0){ continue; } // console.log(i); //1,2,3,4,5,7,8,9,10,11,13,14 num++; /**i=1,num=1;i=2,num=2;i=3,num=3,i=4,num=4,i=5,num=5,i=6,num=5;i=7,num=6,i=8,num=7;i=9,num=8; i=10,num=9;i=11,num=10,i=12,num=10,i=13,num=11;i=14,num=12**/ } console.log(num)//12 </script> </body> </html>
continue例子2：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>break和continue语句</title> </head> <body> <h2>continue：结束本次循环，继续开始下一次</h2> <script type="text/javascript"> for (var s = 0, j = 1; j <= 10; j++) { //如果i是5的倍数 if (j % 5 == 0) { continue; } // console.log(j); //1,2,3,4,6,7,8,9 s+=j;//j=1,s=1;j=2,s=3;j=3,s=6; j=4,s=10;j=5,s=10;j=6,s=16;j=7,s=23;j=8,s=31,j=9,s=40 } console.log(s) //40 </script> </body> </html>
continue例子3：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>break和continue语句</title> </head> <body> <h2>continue：结束本次循环，继续开始下一次</h2> <script type="text/javascript"> //打印所有0-50之间除20和30之外的5的倍数 for (var n = 0; n <= 50; n+=5) { if(n==20 || n==30){ continue; } console.log(n);//打印出所有5的倍数；0,5,10,15,20,25,30,35,40,45,50 } </script> </body> </html>