以下的保留字不可以用作变量,函数名,对象名等,其中有的保留字是为以后JAVASCRIPT扩展用的.abstract
boolean break byte case catch char class const continue
default do double else extends false final finally float
for function goto if implements import in instanceof
int interface long native new null package private
protected public return short static super switch
synchronized this throw throws transient true
try var void while with
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