查找元素

查找某个元素在数组中位置

indexOf()方法

        arr目标数组
        findWhat 要查找的内容
        indexTemp 从指定索引位置开始
    */
    function queryLocation(arr,findWhat,indexTemp){
        if(indexTemp == undefined){
            indexTemp = 0;
        }
        if(arr.length < 1){return;}
        var indexArr = [];
        function queryLR(findWhat,indexTemp){
            if(arr.indexOf(findWhat,indexTemp) != -1){
                indexArr.push(arr.indexOf(findWhat,indexTemp));
                indexTemp++;
                queryLR(findWhat,indexTemp);
            }
            removeDuplicates(indexArr);
        }
        //得到的数组去重复--arrDup为将要去重的数组
        function removeDuplicates(arrDup){
            if(arrDup.length <= 1){return arrDup;}
            for (var i = 0; i < arrDup.length; i++) {
                if(arrDup.indexOf(arrDup[i]) != i){
                    arrDup.splice(i,1);
                    i--;
                }
            }
            return arrDup;
        }
        queryLR(findWhat,indexTemp);
        return indexArr;
    }
    //测试案例
    var t = [1,2,3,1,4,5,1,3,6,1,7,1];
    var result = queryLocation(t,1);
    console.log(result);