[JavaScript]-----语法、关键保留字及变量

ECMAScript的关键字：

break,else,new,var,case,finally,return,void,catch,for,switch,while,continute,function,this,with,default,if,throw,delete,in,try,do,instanceof,typeof,

第三版保留字：

abstract  enum  int  short
boolean  export  interface  static
byte  extends  long  super
char  final  native  synchronized
class  float  package  throws
const  goto  private  transient
debugger  implements  protected  volatile
double  import  public