JavaScript Learning notes (i)

Ready to re-complete the further study of JavaScript, mainly pay attention to some common problems, less nonsense.

1. Add the <script> tag, which will have two forms:

<= "Text/javascript"></script> <   = "JavaScript" > </script > 

One of the second forms is not recommended for use.

2. When <frameset> is used, the JavaScript code cannot execute inside it and must be placed outside it.

<Scripttype= "Text/javascript">Alert ("OK") ; //can perform    </Script>    <Framesetrows= "50%, *">    <Scripttype= "Text/javascript">Alert ("NO") ; //cannot execute    </Script>    </Frameset>

3. Data type:
A. Value type (base type)
numeric type, String type, Boolean type
B. Reference types

View the type of definition,
typeof variable Name,

<= "Text/javascript">    var=10  ;    document.write (typeof  tmp); </ Script >    

4. The parameters in the function do not write the type (this is used to C + +, etc. people are prone to error)

Function Plus (Var a, var b) {...} Error function Plus (A, b) {...} That's right

JavaScript Learning notes (i)