流星：变量中的变量

Question

我想在变量的帮助下更新数组，这就是我的源代码：

var y = Flags.findOne({_id: "flagsone"});

// This one works, but I need the other one
// Books.update({_id:book}, {$set: {"score20130901.5": 222}});

   Books.update({_id:book}, {$set: {"score20130901.[y.flag1]": 222}});

有人知道，我如何将变量放在一起？

Answer 1

var y = Flags.findOne({_id: "flagsone"});
var props = {};
props["score20130901." + y.flag1] = 222;
Books.update({_id:book}, {$set: props});