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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¡£

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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);
});

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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]

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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]

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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

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