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Summary of JavaScript array operations

黄舟
Release: 2017-08-04 10:18:54
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People who are engaged in the Internet, whether it is the traditional web side or the mobile Internet (webview) side, will deal with JS (JavaScript) to a greater or lesser extent. The following are the common operations and methods of js array (array)

1. Creation of javaScript array

1.JS allows the creation of an array with a variable length , a fixed-length array, or an array with default values.

The declaration or creation method is as follows:

Summary of JavaScript array operations

2. Manipulate the elements in the JS array

1. Assign value : You can access the element at the specified position of the js array through index (subscript) and assign a value to it.

The index (subscript) starts at 0.

The assignable type is: numerical value, character, string or object

The method is as follows:

Summary of JavaScript array operations

#2. Visit. The element at the specified position of the js array can be accessed through index (subscript).

The method is as follows:

Summary of JavaScript array operations

3. Adding array elements

1. The adding method is divided according to the insertion position 3 types: the starting position of the array, the end of the array, or the specified position of the array

Summary of JavaScript array operations

##4. Deletion of array elements

1. There are three types of deletion of array elements: deletion of elements at the beginning of the array, deletion of elements at the end of the array, or deletion of elements of a specified length at a specified position. element.

Summary of JavaScript array operations

5. Interception and merging of array elements

1. Interception of array elements: You can use the built-in function slice(start, [end]) to intercept array elements starting from the start position and ending at the end position.

Summary of JavaScript array operations

2. Merging of array elements: You can use the built-in function concat([item1[, item2[, . . . [ ,itemN]]]]); Connect multiple arrays into one array.

Summary of JavaScript array operations

6. Array sorting

1. Arrays can be sorted by themselves through built-in functions. There are two sorting methods, one is natural sorting and the other is reverse sorting

Summary of JavaScript array operations

7. Other useful built-in functions or properties of JS

1. Get the length of the array (Array). It can be obtained through the length attribute, the format is:

Summary of JavaScript array operations

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