Tham chiếu mảng JavaScript
Đối tượng mảng
Đối tượng Array được sử dụng để lưu trữ nhiều giá trị trong một biến duy nhất:
const cars = ["Saab", "Volvo", "BMW"];
Chỉ số mảng dựa trên 0: Phần tử đầu tiên trong mảng là 0, phần tử thứ hai là 1, v.v.
Để có hướng dẫn về Mảng, hãy đọc Hướng dẫn về Mảng JavaScript của chúng tôi .
Phương thức mảng JavaScript
Method | Description |
---|---|
concat() | Joins two or more arrays, and returns a copy of the joined arrays |
copyWithin() | Copies array elements within the array, to and from specified positions |
entries() | Returns a key/value pair Array Iteration Object |
every() | Checks if every element in an array pass a test |
fill() | Fill the elements in an array with a static value |
filter() | Creates a new array with every element in an array that pass a test |
find() | Returns the value of the first element in an array that pass a test |
findIndex() | Returns the index of the first element in an array that pass a test |
forEach() | Calls a function for each array element |
from() | Creates an array from an object |
includes() | Check if an array contains the specified element |
indexOf() | Search the array for an element and returns its position |
isArray() | Checks whether an object is an array |
join() | Joins all elements of an array into a string |
keys() | Returns a Array Iteration Object, containing the keys of the original array |
lastIndexOf() | Search the array for an element, starting at the end, and returns its position |
map() | Creates a new array with the result of calling a function for each array element |
pop() | Removes the last element of an array, and returns that element |
push() | Adds new elements to the end of an array, and returns the new length |
reduce() | Reduce the values of an array to a single value (going left-to-right) |
reduceRight() | Reduce the values of an array to a single value (going right-to-left) |
reverse() | Reverses the order of the elements in an array |
shift() | Removes the first element of an array, and returns that element |
slice() | Selects a part of an array, and returns the new array |
some() | Checks if any of the elements in an array pass a test |
sort() | Sorts the elements of an array |
splice() | Adds/Removes elements from an array |
toString() | Converts an array to a string, and returns the result |
unshift() | Adds new elements to the beginning of an array, and returns the new length |
valueOf() | Returns the primitive value of an array |
Thuộc tính mảng JavaScript
Property | Description |
---|---|
constructor | Returns the function that created the Array object's prototype |
length | Sets or returns the number of elements in an array |
prototype | Allows you to add properties and methods to an Array object |