以下的保留字不可以用作變量,函數(shù)名,對(duì)象名等,其中有的保留字是為以后JAVASCRIPT擴(kuò)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