Array.prototype.unique1 = function () { var r = new Array(); label:for(var i = 0, n = this.length; i for(var x = 0, y = r.length; x if(r[x] == this[i]) { continue label; } } r[r.length] = this[i]; } return r; }
第二种:用了正则表达式
Array.prototype.unique2 = function () { return this.sort().join(",,").replace(/(,|^)([^,]+)(,,\2)+(,|$)/g,"$1$2$4").replace(/,,+/g,",").replace(/,$/,"").split(","); }
第三种:用了hasOwnProperty
Array.prototype.unique3 = function() { var temp = {}, len = this.length; for(var i=0; i var tmp = this[i]; if(!temp.hasOwnProperty(tmp)) { temp[this[i]] = "my god"; } }
len = 0; var tempArr=[]; for(var i in temp) { tempArr[len++] = i; } return tempArr; }
第四种:先排序,再比较相邻的
Array.prototype.unique4 = function () { var temp = new Array(); this.sort(); for(i = 0; i if( this[i] == this[i+1]) { continue; } temp[temp.length]=this[i]; } return temp;