nan

var A1;var a2 = True;var a3 = 1;var a4 = "Hello"; var a5 = new Object (); var a6 = null;var a7 = nan;var A8 = Undefined;alert   (typeof a); Show "undefined" alert (typeof A1); Show "undefined" alert (typeof A2); Displays "boolean" Alert (typeof A3); 

1. Type analysis:JS data types have undefined,boolean,number,string,object, such as 5, the first 4 are the original type, the 5th is the reference type.var A1;var a2 = true;var a3 = 1;var a4 = "Hello";var A5 = new Object ();var a6 = null;var a7 =

1. Type analysis:JS data types have undefined,boolean,number,string,object, such as 5, the first 4 are the original type, the 5th is the reference type.CodeCode highlighting produced by Actipro Codehighlighter (freeware)

Problem: When using the TensorFlow training network, it was found that each time a batch training, its loss is Nan, resulting in a accuracy of 0. Nan is an infinity or a non-numeric value, and is typically infinite when a number is divided by 0

I often get Nan in as3, but I always think that C ++ is of a weak type. I only need the memory. In addition, I usually have a lot of dealings with uint32, Today, we will step on the trap. A crash is generated when the value is-Nan (0x400000.

Reference: Teacher Nan huaijin's "Chuang Tzu nanhua" Miss Nan huaijin's book, "Chuang Tzu nanhua", prefers reading it. I will check it back every night. I have some experiences, record it, and hope it will be helpful to everyone. If there are any

Distinguish underfined, null, and Nan First, let's look at the running result of the following statement: 1: VaRA; 2:Alert ();// Display "undefined" 3:Alert (TypeofA );// Display "undefined" 4:Alert (B); // display"Undefined" The value

Source: http://blog.csdn.net/kupe87826/article/details/8306780   Reference: http://stackoverflow.com/questions/4744437/testing-if-float-value-is-nan Http://stackoverflow.com/questions/570669/checking-if-a-double-or-float-is-nan-in-c

js judging undefined typeToday you use ShowModalDialog to open a page and return a value. When opening a page click the Close button or direct point on the browser close then the return value is undefinedso smart to judgevar

NaN (not is number) means that the integer and floating-point numbers are numbers in JS.In addition, number has a special value, NaN.A situation in which a Nan value may be generated1, expression calculation,① If an expression contains a minus sign,

1, Nan (not a number) is not numeric, not equal to any number, including itself, can be judged by isNaN (), when Praseint () and prasefloat () can not parse the return NaN. Nan is a property under the Number object, number. NaNtypeof (NaN)//return

literal constant without quotes Nan is a special value that represents not a non-numeric number. Because Nan is always in a relatively unequal situation, in any number, including Nan, it is usually an error condition for a function that indicates

Google V8 JS engine through C + + extension of the article many, Google V8 JS Belt example is easy to understand. But most of the articles are of the Hello World type, and the real use of it is found everywhere is a pit. The most classic example of

Undefined: A variable is not declared or declared but not assigned, or the variable never appears.Null: A variable has no valueNaN: Non-numericText and Boolean types of data are theoretically considered Nan because they are not numbers, but in

1. Null indicates an object that does not exist, and 0 when it is converted to a value. It means "no object", that is, it should not have a value and is commonly used to indicate that a function is attempting to return an object that does not exist.

1. mathematical operations defined by math objects Javascript supports some complex arithmetic operations. These complex operations are implemented by using functions and constants defined as attributes of the math object: Math. Pow (9007199254740992

We know that cosmetic operations in Java do not allow 0 to be the denominator, but are possible in floating-point operations, so there is a special case of Nan and infinity, both of which are illegal floating-point data. 1.Infinity: The numerator is

1. Type analysis :The data type in JS has 5 kinds of undefined,boolean,number,string,object, the first 4 is the original type, and the 5th type is reference.Code Copy Code code as follows: var A1; var a2 = true; var a3 = 1; var

1. Type Analysis:The data types in js include undefined, boolean, number, string, and object. The first four are original data types and the second are reference data types.Code Copy codeThe Code is as follows: var a1; Var a2 = true; Var a3 = 1; Var

1. Type Analysis:The data types in js include undefined, boolean, number, string, and object. The first four are original data types and the second are reference data types.CodeCopy codeThe Code is as follows:Var a1;Var a2 = true;Var a3 = 1;Var a4 =