db.getCollection("interface").find({
    project_id: 167
}).forEach(function(rep) {
    a = rep.path;
    print("原字段：" + a);
    b = a.replace("AAAAA", "BBBBB");
    rep.path = b;
    db.getCollection("interface").update({
        _id: rep._id
    }, {
        $set: {
            path: b
        }
    });
    c = rep.path;
    print("替換后后后：" + c);
})