js 向数组前、后 添加元素

将新项添加到数组-起始位置:

unshift()

var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.unshift("Lemon","Pineapple");

fruits 将输出：

Lemon,Pineapple,Banana,Orange,Apple,Mango

unshift() 方法可向数组的开头添加一个或更多元素，并返回新的长度。

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将新项添加到数组-末尾

push()

var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.push("Lemon","Pineapple");

fruits 将输出：

Banana,Orange,Apple,Mango,Lemon,Pineapple

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简单记录