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JavaScript? while ??

while ??: ??? true? ?? ?? ?? ??? ????? ?????.

while(??? ??)

{

??? true?? ?? ?? ??? ?????.

}

while ?? ?? ??:

  • Before ??? ???? ??? ????? ???(??? ???? ??? ???? ??).

  • while? ??? true?? ?? ??? ??({ })? ?? ?????. ??? ???? ??? ?????.

  • ?? ???? "?? ????" ?? ??? ???. ?, ? ??? ?? ?? ??? ? ????. ??? ?? "?? ??"? ?????.

??? ?? ???????:

1~10 ??? ?? ??? ?????.

<!DOCTYPE HTML>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        <title>php.cn</title>
        <script> 
        var i = 1;
        while(i<=10){
            document.write(i);
            i++ //變量更新，是為了避免出現(xiàn)“死循環(huán)”
        }
        </script>
    </head>
    <body>
    </body>
</html>

???? ??? ???. ? ?? ?? ? ??? ?????.

  • ?? ???

  • ??? ??

  • ?? ????

1~100 ??? ?? ?? ??

<!DOCTYPE HTML>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        <title>php.cn</title>
        <script> 
        //變量初始化
        var i = 1;
        //條件判斷
        while(i<=100){
            //如果是奇數(shù)，則輸出
            if(!(i%2==0)){
                document.write(i+"  ");
            }
            //變量更新
            i++;
        }
        </script>
    </head>
    <body>
    </body>
</html>



???? ??
||
<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>php.cn</title> <script> var i = 1; while(i<=10){ document.write(i); i++ //變量更新，是為了避免出現(xiàn)“死循環(huán)” } </script> </head> <body> </body> </html>