SQL：如何生成下个日期的日期(SQL: How to produce next date given month and day)

 在javascript中，你不能使用变量作为对象文字中的属性名称，这就是你正在做的。 
 
 尝试一下： 
 
var a = 'someProperty';

var o = {a: 'somePropertyValue'};

console.log(o);
 
 将打印{ a: 'somePropertyValue' }不是{someProperty:'somePropertyValue} 。 
 
 如果javascript允许在对象文字表示法中引用属性名称中的变量，则它必须除去未加引号的名称，因为这会导致不明确的名称。 a应该用作属性的值还是应该是变量a的值？ 
 
 尝试使用事先创建的对象crate创建更新对象文本，而不使用对象文字符号，因此您的代码如下所示： 
 
router.get('/vote/:Id/:Value/:Type', function(req, res) {
    var db = req.db;
    var id = req.params.Id;
    var type = req.params.Type;
    var value = parseInt(req.params.Value);
    var newValue = value + 1;
    var collection = db.get('games');

    //We create the $set property/value pair using property assignment, not the object literal
    var updateVal = {};
    updateVal[type] = newValue;

    collection.update(
        {"_id" : id},
        {$set: updateVal}   //use it here
        , function (err, doc) {
            if (err) {
                res.send("There was a problem");
            }
            else {
                res.location("../../../admin");
                res.redirect("../../../admin");
            }
        }
    );
});
 
 更好的是，预先构建整个$set操作。 

In javascript you cannot use variables as property names in object literals, and that's what you're trying to do.
 
Try it:
 
var a = 'someProperty';

var o = {a: 'somePropertyValue'};

console.log(o);
 
will print { a: 'somePropertyValue' } not {someProperty:'somePropertyValue}.
 
If javascript permitted referencing variables in property names in object literal notation it would have to get rid of unquoted names as those would create ambiguity. Should a be used as the value of the property or should it be the value of the variable a? 
 
Try creating the update object literal with an object crated beforehand without the usage of object literal notation, so your code looks something like this:
 
router.get('/vote/:Id/:Value/:Type', function(req, res) {
    var db = req.db;
    var id = req.params.Id;
    var type = req.params.Type;
    var value = parseInt(req.params.Value);
    var newValue = value + 1;
    var collection = db.get('games');

    //We create the $set property/value pair using property assignment, not the object literal
    var updateVal = {};
    updateVal[type] = newValue;

    collection.update(
        {"_id" : id},
        {$set: updateVal}   //use it here
        , function (err, doc) {
            if (err) {
                res.send("There was a problem");
            }
            else {
                res.location("../../../admin");
                res.redirect("../../../admin");
            }
        }
    );
});
 
Even better, construct the whole $set operation beforehand.