面试题：有两个有序数组，判断是否有元素同时存在于两个数组中，最优解

有两个int型数组，已排序，判断是否有元素同时存在于a和b中

var arr1 = [1,2,4,5]

var arr2 = [3,4,6,7,8]

function checkOwnSameItem(arr1,arr2) {

    var len1 = arr1.length;
    var len2 = arr2.length;

    var indexA = indexB = 0;

    while (indexA < len1 && indexB < len2) {
    var itemA = arr1[indexA];
    var itemB = arr2[indexB];

    if (itemA == itemB )
    {
        console.log("====find the first same item:"+itemA+",....in arr1 index:"+indexA+",...arr2 index:"+indexB);
        return true ;
    }
    else if(itemA < itemB) {
        indexA ++;
    }
    else
    {
        indexB ++;
    }


    }
}

checkOwnSameItem(arr1,arr2);

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来源： https://blog.csdn.net/karaa/article/details/90214607