js使用逗号拼接id并去重

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var ids = '111,222,333,333,444,111'; // 将字符串转化成数组 var idsArr = ids.split(","); //[111,222,333,333,444,111] // 数组去重 var uniqueIds = unique(idsArr); //[111,222,333,444] ids = ''; //数组转成用逗号分隔的字符串 uniqueIds.forEach(function(item) {     if(ids == '') {         ids = item;     } else {         ids = ids + ',' + item;     } }) //'111,222,333,444'   //数组去重  function unique(arr){       var newArr = [];       for(var i = 0; i < arr.length; i++){           for(var j = i+1; j < arr.length; j++){               if(arr[i] == arr[j]){                   ++i;               }           }           newArr.push(arr[i]);       }       return newArr;   }