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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()"?
2015-07-25
源自:DOM事件探秘 4-1
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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。
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
wengyaqiang 提問者
zoe0773 回復(fù) wengyaqiang 提問者
舉報
DOM事件?本課程會通過實例來給小伙伴們講解如何使用這些事件
1 回答DOM0級一定要用匿名函數(shù)嗎
2 回答函數(shù)名為啥不用加引號呀?
1 回答為什么函數(shù)名不能加括號
2 回答DOM2級事件匿名函數(shù)如何移除?
1 回答這個用法是怎么回事呀,addHander:function?可以這樣用函數(shù)名:函數(shù)主體定義函數(shù)嗎?
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2021-09-12
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2016-01-16
以我的理解,給你舉個例子,參考參考:
(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。
2015-07-26
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