尊龙凯时人生就是搏

jsÖÐÔõÑù±éÀúÊý×é

ÔÚ javascript ÖбéÀúÊý×飬ÓÐÎåÖÖ³£ÓÃÒªÁ죺for Ñ­»·£ºÖð¸ö±éÀúÊý×éÔªËØ¡£foreach()£ºÌṩһ¸ö»Øµ÷º¯Êý£¬¶Ôÿ¸öÔªËØŲÓá£map()£º½¨ÉèÒ»¸öÐÂÊý×飬ÆäÖаüÀ¨¶Ôÿ¸öÔªËØÓ¦Óú¯ÊýµÄЧ¹û¡£filter()£º½¨ÉèÒ»¸öÐÂÊý×飬ÆäÖаüÀ¨Í¨¹ýº¯Êý²âÊÔµÄÔªËØ¡£reduce()£º½«Êý×éÔªËØÀÛ»ýµ½µ¥¸öÖµ¡£

ÔõÑùÔÚ JavaScript ÖбéÀúÊý×é

ÔÚ JavaScript ÖУ¬±éÀúÊý×éÓжàÖÖÒªÁ죬ÿÖÖÒªÁ춼ÓÐÆäÌض¨µÄÓÃÀý¡£ÒÔÏÂÊdz£ÓõıéÀúÊý×éµÄÒªÁ죺

for Ñ­»·

ÕâÊÇ×î»ù±¾µÄ±éÀúÊý×éµÄÒªÁ죬ËüʹÓÃÒ»¸ö for Ñ­»·Öð¸ö±éÀúÊý×éÖеÄÔªËØ¡£

const numbers = [1, 2, 3, 4, 5];

for (let i = 0; i <p><strong>forEach</strong></p><p>forEach() ÒªÁìÊÇÒ»¸ö¸ü¾«Á·µÄ±éÀúÊý×éµÄÒªÁì¡£ËüÌṩһ¸ö»Øµ÷º¯Êý£¬¸Ãº¯Êý½«¶ÔÊý×éÖеÄÿ¸öÔªËØŲÓá£</p><pre class="brush:php;toolbar:false">const numbers = [1, 2, 3, 4, 5];

numbers.forEach((number) =&gt; {
  console.log(number);
});

µÇ¼ºó¸´ÖÆ

map

map() ÒªÁ콨ÉèÒ»¸öÐÂÊý×飬ÆäÖаüÀ¨¶ÔÊý×éÖÐÿ¸öÔªËØÓ¦Óøø¶¨º¯ÊýµÄЧ¹û¡£

const numbers = [1, 2, 3, 4, 5];

const squaredNumbers = numbers.map((number) =&gt; {
  return number * number;
});

console.log(squaredNumbers); // [1, 4, 9, 16, 25]

µÇ¼ºó¸´ÖÆ

filter

filter() ÒªÁ콨ÉèÒ»¸öÐÂÊý×飬ÆäÖаüÀ¨Í¨¹ý¸ø¶¨º¯ÊýµÄ²âÊÔµÄÊý×éÔªËØ¡£

const numbers = [1, 2, 3, 4, 5];

const evenNumbers = numbers.filter((number) =&gt; {
  return number % 2 === 0;
});

console.log(evenNumbers); // [2, 4]

µÇ¼ºó¸´ÖÆ

reduce

reduce() ÒªÁ콫Êý×éÔªËØÀÛ»ýµ½µ¥¸öÖµ¡£ËüÌṩһ¸ö»Øµ÷º¯Êý£¬¸Ãº¯ÊýÓÐÁ½¸ö²ÎÊý£ºµÚÒ»¸ö²ÎÊýÊÇÀÛ»ýÖµ£¬µÚ¶þ¸ö²ÎÊýÊÇÄ¿½ñÔªËØ¡£

const numbers = [1, 2, 3, 4, 5];

const sum = numbers.reduce((accumulator, number) =&gt; {
  return accumulator + number;
}, 0);

console.log(sum); // 15

µÇ¼ºó¸´ÖÆ

ÄÄÖÖ±éÀúÒªÁì×îÊʺÏÄúµÄÌض¨ÓÃÀýÈ¡¾öÓÚÄúµÄÐèÇó¡£¹ØÓÚ¼òÆӵıéÀú£¬for Ñ­»·»ò forEach() ÒªÁì¾Í×ã¹»ÁË¡£¹ØÓÚ¸üÖØ´óµÄ±éÀú²Ù×÷£¬ÀýÈçÓ³Éä¡¢¹ýÂË»ò¹éÔ¼£¬Ê¹Óà map()¡¢filter() »ò reduce() ÒªÁì¸üΪºÏÊÊ¡£

ÒÔÉϾÍÊÇjsÖÐÔõÑù±éÀúÊý×éµÄÏêϸÄÚÈÝ£¬¸ü¶àÇë¹Ø×¢±¾ÍøÄÚÆäËüÏà¹ØÎÄÕ£¡

ÃâÔð˵Ã÷£ºÒÔÉÏչʾÄÚÈÝȪԴÓÚÏàÖúýÌå¡¢ÆóÒµ»ú¹¹¡¢ÍøÓÑÌṩ»òÍøÂçÍøÂçÕûÀí£¬°æȨÕùÒéÓë±¾Õ¾Î޹أ¬ÎÄÕÂÉæ¼°¿´·¨Óë¿´·¨²»´ú±í尊龙凯时人生就是搏ÂËÓÍ»úÍø¹Ù·½Á¢³¡£¬Çë¶ÁÕß½ö×ö²Î¿¼¡£±¾ÎĽӴýתÔØ£¬×ªÔØÇë˵Ã÷À´ÓÉ¡£ÈôÄúÒÔΪ±¾ÎÄÇÖÕ¼ÁËÄúµÄ°æȨÐÅÏ¢£¬»òÄú·¢Ã÷¸ÃÄÚÈÝÓÐÈκÎÉæ¼°ÓÐÎ¥¹«µÂ¡¢Ã°·¸Ö´·¨µÈÎ¥·¨ÐÅÏ¢£¬ÇëÄúÁ¬Ã¦ÁªÏµ尊龙凯时人生就是搏ʵʱÐÞÕý»òɾ³ý¡£

Ïà¹ØÐÂÎÅ

ÁªÏµ尊龙凯时人生就是搏

13452372176

¿É΢ÐÅÔÚÏß×Éѯ

ÊÂÇéʱ¼ä£ºÖÜÒ»ÖÁÖÜÎ壬9:30-18:30£¬½ÚãåÈÕÐÝÏ¢

QR code
sitemap¡¢ÍøÕ¾µØͼ