var availableTags = [
{value:"fruit",desc:"fruit",groupId:2,userId:4},
{value:"aGan",desc:"normal user",groupId:4,userId:5},
{value:"father's home ",desc:"normal user",groupId:2,userId:4}
].sort(function(a, b) { return a.groupId > b.groupId; });
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这个排序的groupId领域,但我怎么通过排序groupId和value?