31
03/2015
JavaScript数组功能扩展--差集,并集,合集,去重
//数组功能扩展 Array.prototype.each = function(fn){ fn = fn || Function.K; var a = []; var args = Array.prototype.slice.call(arguments, 1); for(var i = 0; i < this.length; i++){ var res = fn.apply(this,[this[i],i].concat(args)); if(res != null) a.push(res); } return a; }; //数组是否包含指定元素 Array.prototype.contains = function(suArr){ for(var i = 0; i < this.length; i ++){ if(this[i] == suArr){ return true; } } return false; } //不重复元素构成的数组 Array.prototype.uniquelize = function(){ var ra = new Array(); for(var i = 0; i < this.length; i ++){ if(!ra.contains(this[i])){ ra.push(this[i]); } } return ra; }; //两个数组的补集 Array.complement = function(a, b){ return Array.minus(Array.union(a, b),Array.intersect(a, b)); }; //两个数组的交集 Array.intersect = function(a, b){ return a.uniquelize().each(function(o){return b.contains(o) ? o : null}); }; //两个数组的差集 Array.minus = function(a, b){ return a.uniquelize().each(function(o){return b.contains(o) ? null : o}); }; //两个数组并集 Array.union = function(a, b){ return a.concat(b).uniquelize(); };
转自:http://qiangmzsx.blog.51cto.com/2052549/1549392
转载请注明:康瑞部落 » JavaScript数组功能扩展--差集,并集,合集,去重
0 条评论