jQuery HashTable

最新推荐文章于 2016-05-11 11:01:58 发布

最新推荐文章于 2016-05-11 11:01:58 发布 · 212 阅读

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本文介绍了一个使用jQuery实现的简单哈希表数据结构。该哈希表支持添加、获取、删除等基本操作，并提供了检查键或值是否存在等功能。通过示例展示了如何在网页中利用这个自定义哈希表进行数据管理。

jQuery.Hashtable = function() { 

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    this.items = new Array(); 

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    this.itemsCount = 0; 

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    this.add = function(key, value) { 

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        if (!this.containsKey(key)) { 

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            this.items[key] = value; 

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            this.itemsCount++; 

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        } 

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        else 

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            throw "key '" + key + "' allready exists." 

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    } 

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    this.get = function(key) { 

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        if (this.containsKey(key)) 

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            return this.items[key]; 

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        else 

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            return null; 

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    } 

18
  

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    this.remove = function(key) { 

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        if (this.containsKey(key)) { 

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            delete this.items[key]; 

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            this.itemsCount--; 

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        } 

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        else 

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            throw "key '" + key + "' does not exists." 

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    } 

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    this.containsKey = function(key) { 

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        return typeof (this.items[key]) != "undefined"; 

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    } 

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    this.containsValue = function containsValue(value) { 

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        for (var item in this.items) { 

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            if (this.items[item] == value) 

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                return true; 

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        } 

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        return false; 

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    } 

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    this.contains = function(keyOrValue) { 

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        return this.containsKey(keyOrValue) || this.containsValue(keyOrValue); 

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    } 

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    this.clear = function() { 

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        this.items = new Array(); 

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        itemsCount = 0; 

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    } 

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    this.size = function() { 

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        return this.itemsCount; 

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    } 

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    this.isEmpty = function() { 

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        return this.size() == 0; 

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    } 

50};

 
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var hashtable = new jQuery.Hashtable(); 

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$(function() { 

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    $('#btnAdd').click(function() { 

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        hashtable.add($('#txtAddKey').val(), $('#txtAddValue').val()); 

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    }); 

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    $('#btnGet').click(function() { 

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        alert(hashtable.get($('#txtGetKey').val())) 

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    }); 

9})