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Detailed function declaration vs function expression

Source: Internet
Author: User
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function declaration

For example: 1. We start with a function with a complete statement, without adding anything.

2 a function name (add)

3. Parameters can be taken without (x, y)

4. There is a number body

To meet the above requirements, we collectively referred to as function declaration!

Additional Trivia points:

Definition and usage

The IsNaN () function is used to check whether its arguments are non-numeric values.

Grammar 
IsNaN (x)
<body>      <script>          function  Add (x, y              ) {if(IsNaN (x) | | | IsNaN (y)) {                   return  // not doing anything.               }              return x+y   // The above judgment returns false, then execution returns x+y           }          alert (add)   // = = Output 3      </script></body>

Detailed function declaration vs function expression

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Related Keywords:
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