JS 实现Map
function Map() { this.arr = new Array(); var struct = function(key, value) { this.key = key; this.value = value; }; this.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); }; this.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; }; this.values=function(){ var value=[] for (var i = 0; i < this.arr.length; i++) { value.push(this.arr[i].value); } return value.join(","); }; this.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); } }; this.size = function() { return this.arr.length; }; this.isEmpty = function() { return this.arr.length <= 0; }; } var map = new Map(); map.put("a","aaaaaaaaaaaaaaa"); map.put("b","bbbbbbbbbbb"); map.put("c","cccccccccccccc"); map.remove("b"); console.info(map.values());
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