JS判断数组中是否有重复值得三种实用方法

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;外语屋 

} 

}

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]); 

} 

}

function isRepeat(arr){ 

var hash = {}; 

for(var i in arr) { 

if(hash[arr[i]]) 

return true; 

hash[arr[i]] = true; 

} 

return false; 

}