我需要使用JavaScript存储一些统计数据，就像我在c#中做的那样:
Dictionary<string, int> statistics;
statistics["Foo"] = 10;
statistics["Goo"] = statistics["Goo"] + 1;
statistics.Add("Zoo", 1);
JavaScript中是否存在哈希表或Dictionary<TKey, TValue>之类的东西? 我如何以这种方式存储值呢?
当前回答
var associativeArray = {};
associativeArray["one"] = "First";
associativeArray["two"] = "Second";
associativeArray["three"] = "Third";
如果你来自面向对象的语言，你应该看看这篇文章。
其他回答
在c#中，代码如下:
Dictionary<string,int> dictionary = new Dictionary<string,int>();
dictionary.add("sample1", 1);
dictionary.add("sample2", 2);
or
var dictionary = new Dictionary<string, int> {
{"sample1", 1},
{"sample2", 2}
};
在JavaScript中:
var dictionary = {
"sample1": 1,
"sample2": 2
}
c#字典对象包含有用的方法，如dictionary. containskey ()
在JavaScript中，我们可以像这样使用hasOwnProperty:
if (dictionary.hasOwnProperty("sample1"))
console.log("sample1 key found and its value is"+ dictionary["sample1"]);
var associativeArray = {};
associativeArray["one"] = "First";
associativeArray["two"] = "Second";
associativeArray["three"] = "Third";
如果你来自面向对象的语言，你应该看看这篇文章。
如果你需要你的键是任何对象，而不仅仅是字符串，那么你可以使用我的jshashtable。
由于JavaScript中的每个对象都像哈希表一样，并且通常是作为哈希表实现的，所以我就这样…
var hashSweetHashTable = {};
function HashTable() {
this.length = 0;
this.items = new Array();
for (var i = 0; i < arguments.length; i += 2) {
if (typeof (arguments[i + 1]) != 'undefined') {
this.items[arguments[i]] = arguments[i + 1];
this.length++;
}
}
this.removeItem = function (in_key) {
var tmp_previous;
if (typeof (this.items[in_key]) != 'undefined') {
this.length--;
var tmp_previous = this.items[in_key];
delete this.items[in_key];
}
return tmp_previous;
}
this.getItem = function (in_key) {
return this.items[in_key];
}
this.setItem = function (in_key, in_value) {
var tmp_previous;
if (typeof (in_value) != 'undefined') {
if (typeof (this.items[in_key]) == 'undefined') {
this.length++;
} else {
tmp_previous = this.items[in_key];
}
this.items[in_key] = in_value;
}
return tmp_previous;
}
this.hasItem = function (in_key) {
return typeof (this.items[in_key]) != 'undefined';
}
this.clear = function () {
for (var i in this.items) {
delete this.items[i];
}
this.length = 0;
}
}
