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js-Variable Type

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Author: User
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<HTML>    <Head>        <title>03-js Variable Type</title>        <!--Set Encoding -        <Metahttp-equiv= "Content-type"content= "Text/html;charset=utf-8">        <Scripttype= "Text/javascript">        /*categories of variables in Java: Basic data type reference data type JS variable classification primitive type Object type  JS Primitive Type------------------------------------------------------------------------------1, number                    Numeric type, which does not distinguish between floating-point types.                    2, string String Type 3, Boolen boolean type 4, null empty type placeholder for object type. 5. Undefined refers to the value that the variable has when it is created, but is not assigned a value.             The derived value of NULL. */                            vara=Ten; varb=3.14; varC="Looser"; varD=true; varF=NULL; vare=undefined; //Var i=new object ();                                //Operator: typeof returns the original typeAlert (typeofa); Alert (typeofb); Alert (typeofc); Alert (typeofd); Alert (typeofe); Alert (typeoff); //alert (typeof i);        </Script>            </Head>    <Body>        </Body></HTML>

Summary: Although there are several basic variable types, it is not necessary to use Boolean, number, and so on when defining.

js-Variable type

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Related Keywords:
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