var a = ["1","2","3"]undefineda.splicesplice() { [native code] }a.splice(2,1)["3"]a["1", "2"]a.splice(2,0,"44")[]a["1", "2", "44"]a.splice(12,0,"44")[]a["1", "2", "44", "44"]
splice
原文：http://www.cnblogs.com/qianduanxiaocaij/p/5439460.html
