javascript 数组去重

//去除数字元素数组function sortnum(a, b) {return a - b;}Array.prototype.unique1 = function() {this.sort(sortnum);var newnumbers = [this[0]];for (var i = 0; i < this.length; i++) {if (this[i] != newnumbers[newnumbers.length - 1]) {newnumbers.push(this[i]);}};return newnumbers;};var mynums = [1, 2, 5, 8, 2, 5, 7, 42, 8, 0];mynums = mynums.unique1();console.log(mynums);//利用json对象 可以取出非数字元素Array.prototype.jsonUnique = function() {var json = {};for (var i = 0; i < this.length; i++) {if(!json[this[i]]){json[this[i]] = 1;}};return json;};var mynumss = [1,2,54,1,43,54,'哈哈','哈哈','我们','为什么','为什么'];mynumss = mynumss.jsonUnique();for(var key in mynumss){console.log(key);}