小編給大家分享一下JavaScript中將元素添加到數(shù)組開頭的方法,希望大家閱讀完這篇文章之后都有所收獲,下面讓我們一起去探討吧!
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1.JavaScript主要用來向HTML頁面添加交互行為。 2.JavaScript可以直接嵌入到HTML頁面,但寫成單獨(dú)的js文件有利于結(jié)構(gòu)和行為的分離。 3.JavaScript具有跨平臺特性,在絕大多數(shù)瀏覽器的支持下,可以在多種平臺下運(yùn)行。
let fruits = ["Apple", "Banana", "Mango"]; fruits.unshift("Orange"); console.log(fruits); // Prints ["Orange", "Apple", "Banana", "Mango"] fruits.unshift("Guava", "Papaya"); console.log(fruits); // Prints ["Guava", "Papaya", "Orange", "Apple", "Banana", "Mango"]
var fruits = ["Apple", "Banana", "Mango"]; var moreFruits = ["Orange", ...fruits]; console.log(moreFruits); // Prints ["Orange", "Apple", "Banana", "Mango"] var someoMoreFruits = ["Guava", "Papaya", ...moreFruits]; console.log(someoMoreFruits); // Prints ["Guava", "Papaya", "Orange", "Apple", "Banana", "Mango"] console.log(fruits); // Prints ["Apple", "Banana", "Mango"]
我們還可以使用concat()
方法在開頭連接兩個(gè)(或更多)數(shù)組。
var fruits = ["Apple", "Banana", "Mango"]; var moreFruits = ["Orange"]; var someoMoreFruits = ["Guava", "Papaya"]; var allFruits = someoMoreFruits.concat(moreFruits, fruits); console.log(allFruits); // Prints ["Guava", "Papaya", "Orange", "Apple", "Banana", "Mango"]
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