JS判断数组中是否有重复值得三种实用方法

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;外语屋 
} 
}

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: 内陆运输

function isRepeat(arr){ var hash = {}; 
for(var i in arr) { 
if(hash[arr[i]]) 
return true; 
hash[arr[i]] = true; 
} 
return false; 
}