如何将某个东西附加到数组中？

Question

How do I append an object (such as a string or number) to an array in JavaScript?

转载于:https://stackoverflow.com/questions/351409/how-to-append-something-to-an-array

Answer 1

Use the push() function to append to an array:

// initialize array
var arr = [
    "Hi",
    "Hello",
    "Bonjour"
];

// append new value to the array
arr.push("Hola");

console.log(arr);

Will print

["Hi", "Hello", "Bonjour", "Hola"]

---

You can use the push() function to append more than one value to an array in a single call:

// initialize array
var arr = [ "Hi", "Hello", "Bonjour", "Hola" ];

// append multiple values to the array
arr.push("Salut", "Hey");

// display all values
for (var i = 0; i < arr.length; i++) {
    console.log(arr[i]);
}

Will print

Hi
Hello
Bonjour
Hola 
Salut
Hey

---

Update

If you want to add the items of one array to another array, you can use firstArray.concat(secondArray):

var arr = [
    "apple",
    "banana",
    "cherry"
];

arr = arr.concat([
    "dragonfruit",
    "elderberry",
    "fig"
]);

console.log(arr);

Will print

["apple", "banana", "cherry", "dragonfruit", "elderberry", "fig"]

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