我要评论js中没有map这个类，只能自己写一个。以下map.js和map-util.js都是自定义的map，任选其一就可以。你可以用它来像java里new map()和put()、remove()、get()等方法。
map.js:
function map() {
var struct = function(key, value) {
this.key = key;
this.value = value;
}
var put = function(key, value){
for (var i = 0; i < this.arr.length; i++) {
if ( this.arr[i].key === key ) {
this.arr[i].value = value;
return;
}
}
this.arr[this.arr.length] = new struct(key, value);
}
var get = function(key) {
for (var i = 0; i < this.arr.length; i++) {
if ( this.arr[i].key === key ) {
return this.arr[i].value;
}
}
return null;
}
var remove = function(key) {
var v;
for (var i = 0; i < this.arr.length; i++) {
v = this.arr.pop();
if ( v.key === key ) {
continue;
}
this.arr.unshift(v);
}
}
var size = function() {
return this.arr.length;
}
var isempty = function() {
return this.arr.length <= 0;
}
this.arr = new array();
this.get = get;
this.put = put;
this.remove = remove;
this.size = size;
this.isempty = isempty;
}
map-util.js:
function map() {
this.elements = new array();
var i;
//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
});
};
this.putfirst = function(_key, _value){
var templist = this.elements;
this.elements = new array();
this.elements.push( {
key : _key,
value : _value
});
for(var i=0;i<templist.length;i++){
this.elements.push(
templist[i]
);
}
}
//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) {
var bln = 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;
};
}
总结
以上所述是小编给大家介绍的 javacript中自定义的map.js 的方法，希望对大家有所帮助
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