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函數(shù)名 和 "函數(shù)名()"

什么時候直接用函數(shù)名調(diào)用函數(shù),什么時候要用"函數(shù)名()"?

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3 回答

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0 回復(fù) 有任何疑惑可以回復(fù)我~

以我的理解,給你舉個例子,參考參考:

function?ab(){
????return?c;
}
var?me?=?ab();?//??(1)
var?me?=?ab;???//??(2)

(1)是調(diào)用;(2)是賦值。

【(1)中,等價于 var me = c。那么這是賦值還是調(diào)用?不要被誤導(dǎo),這是調(diào)用。先調(diào)用了函數(shù)ab,調(diào)用完返回了c,賦值給變量me?!?/p>

那么在什么情況下是賦值?

比如 btn.onclick?=?ab;這種情況,就是把函數(shù)給系統(tǒng),讓系統(tǒng)去調(diào)用。為什么不是btn.onclick = ab(); 如果是這樣,文件加載到這一行,他就會直接執(zhí)行,執(zhí)行完,如果有返回值,就會給btn.onclick返回值,如舉例中返回的是c。如果沒有返回值,則返回null,這樣相當(dāng)于btn.onclick = null。

2 回復(fù) 有任何疑惑可以回復(fù)我~

后者才是函數(shù)的調(diào)用吧,函數(shù)名只是代表了一個函數(shù),單獨(dú)寫出來并不能執(zhí)行,函數(shù)名()才可以執(zhí)行函數(shù),自己的一點理解,不知道能不能幫到你

0 回復(fù) 有任何疑惑可以回復(fù)我~
#1

wengyaqiang 提問者

謝謝你的熱心,我忘記了當(dāng)時提問的背景,問題沒描述清楚,是指比如本節(jié)課中的, window.onload=drag; oTitle.onmousedown=fnDown; 你看這里調(diào)用函數(shù)都沒有加(),就是不太理解()的意義,是否可以寫為 window.onload="drag()" 還是說widow.onload=drag()?
2015-07-26 回復(fù) 有任何疑惑可以回復(fù)我~
#2

zoe0773 回復(fù) wengyaqiang 提問者

這里的 drag 和 fnDown 其實就是一個分別指向這兩個不同函數(shù)的指針。 drag 指向 function drag(){}這個函數(shù)體,同樣 fnDown 也是
2015-10-24 回復(fù) 有任何疑惑可以回復(fù)我~

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