Amazing JavaScript syntax features and javascript syntax features

Amazing JavaScript syntax features and javascript syntax features

I have seen some javascript-related questions published by zhihu. I 'd like to share with you that although N was a long time ago, these questions are quite classic, javascript is a tough language.

1.
Copy codeThe Code is as follows:
(Function (){
Return typeof arguments;
})();

A. "object"
B. "array"
C. "arguments"
D. "undefined"

Answer:

2.
Copy codeThe Code is as follows:
Var f = function g (){
Return 23;
};
Typeof g ();

A. "number"
B. "undefined"
C. "function"
D. Eorror

Answer: D

3.
Copy codeThe Code is as follows:
(Function (x ){
Delete x;
Return x;
}) (1 );

A. 1
B. null
C. undefined
D. Error

Answer:

4.
Copy codeThe Code is as follows:
Var y = 1,
X = y = typeof x;
X;

A. 1
B. "number"
C. undefined
D. "undefined"

Answer: D

5.
Copy codeThe Code is as follows:
(Function f (f ){
Return typeof f ();
}) (Function (){
Return 1;
});

A. "number"
B. "undefined"
C. "function"
D. Error

Answer:

6.

Copy codeThe Code is as follows:
Var foo = {
Bar: function (){
Return this. baz;
},
Baz: 1
};
(Function (){
Return typeof arguments [0] ();
}) (Foo. bar );

A. "undefined"
B. "object"
C. "number"
D. "function"

Answer:

7.

Copy codeThe Code is as follows:
Var foo = {
Bar: function (){
Return this. baz;
},
Baz: 1
};
Typeof (f = foo. bar )();

A. "undefined"
B. "object"
C. "number"
D. "function"

Answer:

8.
Copy codeThe Code is as follows:
Var f = (function f (){
Return "1 ";
}, Function g (){
Return 2;
})();
Typeof f;

A. "string"
B. "number"
C. "function"
D. "undefined"

Answer: B

9.
Copy codeThe Code is as follows:
Var x = 1;
If (function f (){}){
X + = typeof f;
}
X;

A. 1
B. "1 function"
C. "1 undefined"
D. NaN

Answer: C

10.
Copy codeThe Code is as follows:
Var x = [typeof x, typeof y] [1];
Typeof x;

A. "number"
B. "string"
C. "undefined"
D. "object"

Answer: B

11.

Copy codeThe Code is as follows:
(Function (foo ){
Return typeof foo. bar;
})({
Foo :{
Bar: 1
}
});

A. "undefined"
B. "object"
C. "number"
D. Error

Answer:

12.
Copy codeThe Code is as follows:
(Function f (){
Function f (){
Return 1;
}
Return f ();
Function f (){
Return 2;
}
})();

A, 1
B, 2
C. Error (e.g. "Too much recursion ")
D. undefined

Answer: B

13.
Copy codeThe Code is as follows:
Function f (){
Return f;
}
New f () instanceof f;

A, true
B. false

Answer: B

14.
Copy codeThe Code is as follows:
With (function (x, undefined) {}) length;

A, 1
B, 2
C. undefined
D. Error

Answer: B

15.
Copy codeThe Code is as follows:
Which of the following statements produces a running error :()
A. var obj = ();
B. var obj = [];
C. var obj = {};
D. var obj = //;

Answer:

Javascript syntax

Anonymous function execution is equivalent
Var func = function (c ){
Alert (c );

};
Func (2 );

That is, the function is defined and executed at the same time. Note that 2 is the parameter.

What are the syntax of javascript?

Basic JavaScript syntax
1. Data Types: numeric, logical, string, and undefined

2. Writing rules:
1) JavaScript is case sensitive and the statement uses semicolons as the Terminator;
2) supports/*... */and //... annotation statements.
3) The + = +-+ * =/= % = and other operators can be used in the value assignment statement.

2. constants, variables, and expressions-
This is very detailed. You can see it :)~~
Www.catvu.com/asp/JAVA/002.htm

Simplified Javascript syntax in Html
Mileden.51.net/dnly/jsp.htm

Introduction to JavaScript Syntax :)~~
Www.dali.tcc.edu.tw/../2.htm