JS判断一个数组中是不是有重复值的三种方法

Question

如题所述

Answer 1

JS判断一个数组中是否有重复值的三种方法方法一:var ary = new Array("111","22","33","111");var s = ary.join(",")+",";for(var i=0;i<ary.length;i++) {if(s.replace(ary[i]+",","").indexOf(ary[i]+",")-1) {alert("数组中有重复元素：" + ary[i]);break;}}方法二:var ary = new Array("111","22","33","111");var nary=ary.sort();for(var i=0;i<ary.length;i++){if (nary[i]==nary[i+1]){alert("数组重复内容："+nary[i]);}}方法三:function isRepeat(arr){var hash = {};