Detailed explanation of javascript implicit conversion

Javascript is a must-learn technology for web front-end development. What I will share with you today is the basic knowledge of implicit conversion of javascript. I hope it can help everyone learn better.

Convert to Boolean type false

undefined->falSe

null->falSe

numeric type 0 or 0.0 or NaN->falSe

String length is 0-> falSe

Other objects->true

      <隐式转换例子>  

Convert to numerical data

undefined->NaN

null->0

true->1|falSe->0

The content is a number->Number, otherwise it is converted to NaN

Other objects->NaN

      <隐式转换例子>  

Converted to string data

undefined->"undefined"

null->"NaN"

true->"true" falSe->"falSe"

Numeric type->NaN, 0 or a string corresponding to a numerical value

Other objects->If this object exists, it is converted to the toString() method The value of