javascript declare array

ES6 (ECMAScript 6) is the upcoming new version of the JavaScript language standard, code-named Harmony (meaning of harmony, obviously did not keep pace with our country, we have entered the Chinese Dream version). The last standard was enacted in 2009 ES5. The ES6 is currently in the process of standardization and is expected to release the officially finalized version in December 14. But most of the standards are in place, and browser support for ES6

the elements in the array. Shift () Delete and return the first element of the array Slice () Returns the selected element from an existing array Sort () Sorting elements of an array Splice () Deletes the element and adds a new element to

This article mainly introduces the javascript Array Operation Method summary and three attributes in detail. If you need them, please refer to those who have been using js recently and study the operations of js arrays, here is a summary. 1. Create an array The Code is as follows: Var arrayObj = new Array (); // crea

This article mainly introduces the class Array objects in JavaScript. an object is not created by the Array constructor and still presents the behavior of an Array. in this case, these objects are called "class array objects". For more information, see

This article mainly introduces how to delete repeated elements in an array using javascript. The example summarizes several common techniques for deleting repeated elements in an array using javascript, for more information about how to delete repeated elements in an array u

1. indexOf ();LastIndexOf ();For example:2. Find the element position function findall ();var arr = [6,4,6,33,576,0.145,36,66,814, ' apple ', ' person ', 12];function findAll (a,x) {var results = [],Len = A.length,pos = 0;while (Pos pos = A.indexof (X,pos);if (pos = = =-1) break;Results.push (POS);pos = pos + 1;}return results;};findall (arr, ' Apple '); //[9]3. Determine if it is an arrayArray.isarray ();Also available: Object.prototype.toString.call (arr);4.201506111312_ "

The use of Javascript-array objects and array sorting sort

prototype property. Adds a method to the array object that returns the maximum element value in the array. To do this, declare a function, add it to the Array.prototype, and use it. Copy Code code as follows: function Array_max () { var i, max = This[0]; for (i = 1; i { if (Max max = This[i]; } return Max; } Array.prototype.ma

Note: The JAVAScript Array and VBScript array are not only different in syntax, but also have many differences in use. 1. Create an array object. We will introduce how to create an array object in JAVAScript. (In fact, this method

1, array sorting, the default ascending order, the sort () method invokes the ToString () of each item in the array, and then compares the resulting string to sort//sort (): Returns the array after sorting//var arr = [23,1,3,56,42,-1];// Arr.sort ();//alert (arr); -1,1,3,23,42,56//even though each item in the array is

This article mainly introduces the Array usage in Javascript. Examples of common techniques in javascript such as Array traversal, value passing, and comparison are analyzed, for more information about Array usage in Javascript, s

This article mainly introduces the use of Javascript arrays and dictionaries. It analyzes in detail the usage of arrays as arrays and dictionaries in the form of examples, which has some reference value, for more information about how to use Javascript arrays and dictionaries, see the examples in this article. Share it with you for your reference. The specific analysis is as follows: The

1, Length Property The Length property represents the size of the array, which is the number of elements. Because the index of an array always starts with 0, the upper and lower bounds of an array are: 0 and length-1 respectively. Unlike most other languages, the length property of a JavaScript

This article mainly introduces the Array iteration method in javascript. The example analyzes the definition and usage skills of the Array iteration method, for more information about javascript iteration, see the examples in this article. Share it with you for your reference. The specific implementation method is as f

Recommended methods for removing duplicate values from several arrays of JavaScript, javascript Array Array deduplication is a common requirement. We will temporarily consider repeated arrays of the same type. It mainly aims to clarify the ideas and consider the performance. The following methods are available on the I

This article mainly introduces the ultimate Summary of javascript Array deduplication. This article lists three methods of javascript Array deduplication, and analyzes their advantages and disadvantages, if you need it, you can refer to this requirement. You need to delete the repeated elements in the

length-1. Unlike most other languages, the length attribute of the JavaScript array is variable, which requires special attention. When the length attribute is set to a greater value, the status of the entire array does not actually change, except that the length attribute becomes larger. When the length attribute is set to an hour later than the original value,

This article mainly introduces two methods for clearing the array elements in JavaScript, lists several common methods for clearing the array elements in javascript, and compares the two common methods, it has some reference value. If you need it, you can refer to the examples in this article to describe two simple met

asvar a = new Array (1, 2, 3, 4, 5);var B = [1, 2, 3, 4, 5];Both A and B are arrays, except that B uses the implicit declaration to create another instance, at which point the alert (A==B) will eject false1.2 Multi-dimensional arraysIn fact, JavaScript does not support multidimensional arrays, in the ASP can use Dim a (10,3) to define a multidimensional array, i

This article describes how to implement mutual conversion between Array and String in Javascript, and describes how to use the toString and split Methods in JavaScript, for more information about how to convert Array and String in Javascript, see the following example. We wi