用“，”分隔句子，并去掉周围的空格

I have this code:

我有这段代码:

var r = /(?:^\s*([^\s]*)\s*)(?:,\s*([^\s]*)\s*){0,}$/
var s = "   a   ,  b  , c "
var m = s.match(r)
m => ["   a   ,  b  , c ", "a", "c"]
var r = /(?:^\s*(