[Translation] JavaScript quiz

Original article: http://asenbozhilov.com/articles/quiz.html

These questions are fromECMA-262-3Specification.Good luck!

Note: The author wrote the question according to ES3, but I have not found any difference between es5 and es5. I will not explain the answer for the time being. Please go to http://ecma-international.org/ecma-262/5.1/find the answer.

 

2. Function. Prototype. tostring. Call ({
   Name: 'F ',
   Body: 'print ("javascript is hard ")'
   });

   1. Function f () {print ("javascript is hard ");}
   2. Typeerror
   3. Empty string
   4. [Object Function]

4.  New String ({
    tostring: function () {return this ;}, 
    valueof: function () {return this ;}< BR >}); 

   1. typeerror
   2. string value
   3. String object
   4. Object

6.  typeof (new date () + new date (); 

   1. Number
   2. Object
   3. string
   4. undefined

8.  typeof (void null); 

   1. Object
   2. null
   3. undefined
   4. syntaxerror

10.  function f () {}< br> F. prototype = new function; 
     object. prototype. tostring. call (new F (); 

    1. [object function]
    2. [object array]
    3. [object string]
    4. [object]

12. []. Length =-2;

    1. Typeerror
    2. -2
    3. Rangeerror
    4. 0

14. VaR d = math. Pow (2, 33 );
    (D | D) = D;

    1. True
    2. False
    3. Rangeerror

16.  '_ string _'. Replace (/^/, "$ '"); 

    1. _ string _
    2. '_ string _
    3. $ '_ string _
    4. _ string _

18.  eval ('typeof F; function f () {}'); 

    1. undefined
    2. Object
    3. string
    4. function

20. Debugger;

    1. Send money to Microsoft
    2. Syntaxerror may occur.
    3. Put yourSource codeSend an email to Brendan eich
    4. Referenceerror
    5. Scan for viruses during Windows Startup
    6. In Linux, print "the bug is in the above options"

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