js type


Js the data type has 5, the first four of the original type undefined, boolean, number, string, object, etc., fifth reference type.

new Object()

function
undefined variable type is determined, while the other two are determined value of the variable.
undefined can be used to represent the following situation
1. Expresses an undeclared variable,
2. have been declared but not assigned variable,
3. a non-existent object properties


Object is a special null, indicating no value;
NaN3 is a special Number, indicating no value;
comparison operator (== === or)
using ==, if both sides of the different types, js first engine thereof turn into the same type of comparison values is performed;
use ===, will not be cast, different types, certainly not equal.

 

 

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Origin www.cnblogs.com/SZLLQ2000/p/10926478.html