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能詳細(xì)解釋下結(jié)果[a, b]=[12,18]嗎?謝謝大家(我認(rèn)為是12,24)?

能詳細(xì)解釋下結(jié)果[a, b]=[12,18]嗎?謝謝大家(我認(rèn)為是12,24)?

yuqingzhijie3596863 2017-09-16 12:50:10
<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Document</title><script type="text/javascript">var a = 1;var b = 2;function *foo() {a++;yield;b = b * a;a = (yield b) + 3;}function *bar() {b--;yield;a = (yield 8) + b;b = ?a * (yield 2);}function step(gen) {var it = gen();var last;return function() {last = it.next( last ).value;console.log( a, b, last );};}var s1 = step( foo );var s2 = step( bar );s2();s2();s1();s2();s1();s1();s2();console.log( a, b );</script></head><body></body></html>
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2 回答

已采納
?
fdsgasgg

TA貢獻(xiàn)19條經(jīng)驗(yàn) 獲得超12個(gè)贊

代碼執(zhí)行到 yield 時(shí)候才會交出執(zhí)行權(quán).

?你認(rèn)為是24是因?yàn)槟阏J(rèn)為bar最后一次執(zhí)行時(shí)候a應(yīng)該是12,其實(shí)a在s2執(zhí)行yield 2時(shí)候已經(jīng)賦值為9了,因?yàn)橛?jì)算是從左到右執(zhí)行的,

你可以結(jié)合下面的代碼感受下

function*?gen1(){
????console.log('g1',?a?*?(yield?2))
}
function*?gen2(){
????console.log('g2',?(yield?2)?*?a)
}
var?g1?=?gen1(),?g2?=?gen2(),?a?=?9
g1.next()
g2.next()
a?=?12
g1.next(2)?//?18
g2.next(2)?//?24


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1 反對 回復(fù) 2017-09-16
?
慕瓜9220888

TA貢獻(xiàn)868條經(jīng)驗(yàn) 獲得超0個(gè)贊

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反對 回復(fù) 2021-10-20
?
名分開就是姓名

TA貢獻(xiàn)39條經(jīng)驗(yàn) 獲得超4個(gè)贊

這有什么好解釋,12,18就是12,18咯

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反對 回復(fù) 2017-09-16
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