JavaScript中的保留关键字

Question

保留了哪些JavaScript关键字(函数名,变量等)？

Answer 1

这是我的诗,其中包括JavaScript中的所有保留关键字,并致力于那些在当下保持诚实的人,而不仅仅是尝试得分:

Let this long package float, 
Goto private class if short.
While protected with debugger case,  
Continue volatile interface.
Instanceof super synchronized throw, 
Extends final export throws.  

Try import double enum?  
- False, boolean, abstract function, 
Implements typeof transient break!
Void static, default do,  
Switch int native new. 
Else, delete null public var 
In return for const, true, char
…Finally catch byte.

Answer 2

我们应该链接到实际的信息来源,而不仅仅是最热门的谷歌搜索.

http://developer.mozilla.org/En/Core_JavaScript_1.5_Reference/Reserved_Words

JScript 8.0:http: //msdn.microsoft.com/en-us/library/ttyab5c8.aspx

Answer 3

要补充benc的答案,请参阅标准ECMA-262.这些是官方保留词,但只有学者忽略了尊重标准的实施.对于最受欢迎的实现的保留字,即firefox和Internet Explorer,请参阅benc的答案.

EMCAScript-262中的保留字是关键字 s,Future Reserved Word,NullLiteral和BooleanLiteral,其中关键字是

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

在未来的保留字 s的

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

该NullLiteral是

null

和BooleanLiteral是

true
false

Answer 4

我刚刚在JavaScript和jQuery中阅读了这篇文章:The Missing Manual:

并非所有这些保留字都会在所有浏览器中引起问题,但在命名变量时最好避开这些名称.

JavaScript关键字: break, case, catch, continue, debugger, default, delete, do, else, false, finally, for, function, if, in, instanceof, new, null, return, switch, this, throw, true, try, typeof, var, void, while, with.

保留供将来使用: abstract, boolean, byte, char, class, const, double, enum, export, extends, final, float, goto, implements, import, int, interface, let, long, native, package, private, protected, public, short, static, super, synchronized, throws, transient, volatile, yield.

浏览器中预定义的全局变量: alert, blur, closed, document, focus, frames, history, innerHeight, innerWidth, length, location, navigator, open, outerHeight, outerWidth, parent, screen, screenX, screenY, statusbar, window.

Answer 5

这是一种浏览器和语言版本无关的方法,用于确定JavaScript引擎是否将特定字符串视为关键字.这个答案的功劳提供了解决方案的核心.

function isReservedKeyword(wordToCheck) {
    var reservedWord = false;
    if (/^[a-z]+$/.test(wordToCheck)) {
        try {
            eval('var ' + wordToCheck + ' = 1');
        } catch (error) {
            reservedWord = true;
        }
    }
    return reservedWord;
}