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Editor to share with you how JavaScript to achieve Set, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Simple implementation of Set

Window.Set = window.Set | | (function () {function Set (arr) {this.items = arr? Unique (arr): []; this.size = size of this.items.length; / / Array} Set.prototype = {add: function (value) {/ / add an element. If the element already exists, skip it and return the Set structure itself. If (! this.has (value)) {this.items.push (value); this.size++;} return this;}, clear: function () {/ / clears all members with no return value. This.items = [] this.size = 0}, delete: function (value) {/ / delete a value and return a Boolean value indicating whether the deletion is successful. Return this.items.some ((v, I) = > {if (v = value) {this.items.splice (iMagne1) return true} return false})}, has: function (value) {/ / returns a Boolean value Indicates whether the value is a member of Set. Return this.items.some (v = > v = value)}, values: function () {return this.items},} return Set;} (); what JavaScript can do 1. It can make web pages interactive, such as responding to user clicks and providing users with a better experience. two。 You can process forms, verify user input, and provide timely feedback to save users time. 3. The page can be created dynamically according to the user's operation. 4 using JavaScript, you can set up some temporary information that cookie stores on the browser.

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