break与continue语句_随笔

break与continue语句

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>

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原文地址: https://outofmemory.cn/zaji/589027.html

break与continue语句

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