js creates a Map code to share

小云云
Release: 2018-03-21 17:00:04
Original
2486 people have browsed it

This article mainly shares with you the js code to create a Map, hoping to help everyone.

function Map() { this.elements = new Array(); //获取MAP元素个数 this.size = function() { return this.elements.length; } //判断MAP是否为空 this.isEmpty = function() { return(this.elements.length < 1); } //删除MAP所有元素 this.clear = function() { this.elements = new Array(); } //向MAP中增加元素(key, value) this.put = function(_key, _value) { this.elements.push( { key : _key, value : _value }); } //删除指定KEY的元素,成功返回True,失败返回False this.remove = function(_key) { var bln = false; try{ for(i = 0; i < this.elements.length; i++) { if(this.elements[i].key == _key) { this.elements.splice(i, 1); return true; } } } catch(e) { bln = false; } return bln; } //获取指定KEY的元素值VALUE,失败返回NULL this.get = function(_key) { try{ for(i = 0; i < this.elements.length; i++) { if(this.elements[i].key == _key) { return this.elements[i].value; } } } catch(e) { return null; } } //获取指定索引的元素(使用element.key,element.value获取KEY和VALUE),失败返回NULL this.element = function(_index) { if(_index < 0 || _index >= this.elements.length) { return null; } return this.elements[_index]; } //判断MAP中是否含有指定KEY的元素 this.containsKey = function(_key) { varbln = false; try{ for(i = 0; i < this.elements.length; i++) { if(this.elements[i].key == _key) { bln = true; } } } catch(e) { bln = false; } return bln; } //判断MAP中是否含有指定VALUE的元素 this.containsValue = function(_value) { var bln = false; try{ for(i = 0; i < this.elements.length; i++) { if(this.elements[i].value == _value) { bln = true; } } } catch(e) { bln = false; } return bln; } //获取MAP中所有VALUE的数组(ARRAY) this.values = function() { var arr = new Array(); for(i = 0; i < this.elements.length; i++) { arr.push(this.elements[i].value); } return arr; } //获取MAP中所有KEY的数组(ARRAY) this.keys = function() { var arr = new Array(); for(i = 0; i < this.elements.length; i++) { arr.push(this.elements[i].key); } return arr; } } //new 一个Map就可以用了 var map = new Map();
Copy after login

The above is the detailed content of js creates a Map code to share. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn:Public welfare online PHP training,Help PHP learners grow quickly!