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严格说起来并不是从零开始,至少我们有一些规范可以参考,例如:
1997 ECMA-262 1.0
1998 ECMA-262 2.0
1999 ECMA-262 3.0
2007 ECMA-262 4.0 (未得到支持)
2011 ECMA-262 5.1
2015 ECMA-262 6.0
2016 ECMA-262 7.0
2017 ECMA-262 8.0