以下的保留字不可以用作變量,函數名,對象名等,其中有的保留字是爲以後JAVASCRIPT擴展用的.
| 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 |