How to use JavaScript to interact with Android and IOS Back

Android

window.jsCallBack.func(status, msg);

IOS

window.location.href = 'objc://' + 'getParam1:withParam2::/' + EncodeUtf8(status) + ':/' + EncodeUtf8(msg);

/** utf8 encoding */
function EncodeUtf8(s1) {
    /** func escape is used to encode characters outside alphabet like "Visit W3School!" -> "Visit%20W3School%21" */
    var s = escape(s1);
    var sa = s.split("%"); /** sa[1] = u6211 */
    var retV = "";
    if (sa[0] != "") {
        retV = sa[0];
    }
    for (var i = 1; i < sa.length; i++) {
        if (sa[i].substring(0, 1) == "u") {
            retV += Hex2Utf8(Str2Hex(sa[i].substring(1, 5)));
            if (sa[i].length >= 6) {
                retV += sa[i].substring(5);
            }
        }
        else retV += "%" + sa[i];
    }
    return retV;
}

function Str2Hex(s) {
    var c = "";
    var n;
    var ss = "0123456789ABCDEF";
    var digS = "";
    for (var i = 0; i < s.length; i++) {
        c = s.charAt(i);
        n = ss.indexOf(c);
        digS += Dec2Dig(eval(n));

    }
    //return value;
    return digS;
}

function Dec2Dig(n1) {
    var s = "";
    var n2 = 0;
    for (var i = 0; i < 4; i++) {
        n2 = Math.pow(2, 3 - i);
        if (n1 >= n2) {
            s += '1';
            n1 = n1 - n2;
        }
        else
            s += '0';

    }
    return s;

}

function Dig2Dec(s) {
    var retV = 0;
    if (s.length == 4) {
        for (var i = 0; i < 4; i++) {
            retV += eval(s.charAt(i)) * Math.pow(2, 3 - i);
        }
        return retV;
    }
    return -1;
}

function Hex2Utf8(s) {
    var retS = "";
    var tempS = "";
    var ss = "";
    if (s.length == 16) {
        tempS = "1110" + s.substring(0, 4);
        tempS += "10" + s.substring(4, 10);
        tempS += "10" + s.substring(10, 16);
        var sss = "0123456789ABCDEF";
        for (var i = 0; i < 3; i++) {
            retS += "%";
            ss = tempS.substring(i * 8, (eval(i) + 1) * 8);


            retS += sss.charAt(Dig2Dec(ss.substring(0, 4)));
            retS += sss.charAt(Dig2Dec(ss.substring(4, 8)));
        }
        return retS;
    }
    return "";
}