<script language="javascript">    function getNoRepeat() {        return arguments[0].join('‖').match(/(\b[^‖]+\b)(?!.*‖\1\b)/ig);    }    var tmpArr = [1, 'a', 'ab', 'abc', 'd', 1.2, 'a+b', 'd', 'e', 5, 'a', 1, 'h', 'c', 'ab'];    var retArr = getNoRepeat(tmpArr);    alert(retArr); </script> <script> alert("1,11,1.11,1111,111,11,1,1.11".match(/(\b\d+(?:\.\d+)?\b)(?!.*,\1\b)/g)) </script> <script> alert("123450,0,1,2,5,3,2,12,4,1,1,123450".match(/(\b\d+\b)(?!.*,\1(,|$))/ig)) </script> <script> alert("123450,0,1,2,5,3,2,12,4,1,1,123450".match(/(\b\d+\b)(?!(?:,[^,]+)*,\1(?:,|$))/ig)) </script> <script> var s = "0,1,2,5,3,2,12,4,1,1,123450"; var sTmp = (","+s.split(",").reverse().join(",")+",").replace(/,([^,]+)(?=,.*,\1,)/ig, '').split(",").reverse().join(); sTmp = sTmp.substr(1, sTmp.length-2); alert(sTmp) </script> <script> var strArr = "123450,0,1,2,5,3,2,12,4,1,1,123450".split(",") var str = "," for(i = 0; i < strArr.length; i++) {   if(str.indexOf("," + strArr[i] + ",") == -1)str += strArr[i] + "," } alert(str.substring(1,str.length - 1)) </script>