js如何比较两个数组相同的元素与位置？

<script type="text/javascript">

    var str1 = "good, site, bfw";
    var str2 = "good, site, bfw123";
    var result = diff(str1, str2, ','); // 对象
    alert(result);
    var rs = "" + result; // " bfw, bfw123"
    var df1 = result.diff1; // [" bfw"]
    alert(df1);
    var df2 = result.diff2; // [" bfw123"]
    alert(df2);

    // 比较2个字符串内元素的不同(字符1, 字符2, 分隔符可选)
    function diff(str1, str2, separator) {
        //
        str1 = str1 || "";
        str2 = str2 || "";
        separator = separator || ",";
        // arr中有ele元素
        function hasElement(arr, ele) {
            // 内存循环
            var hasItem1 = false;
            for (var i2 = 0; i2 < arr.length; i2++) {
                //
                var item2 = arr[i2] || "";
       ...

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<script type="text/javascript">
    var arr1 = ["good", "site", "bfw"];
    var arr2 = ["good", "site3", "bfw"];
    var samecount = 0;...

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