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JS Knowledge Point Supplement

Source: Internet
Author: User
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1 <!DOCTYPE HTML>2 <HTML>3     <Head>4         <MetaCharSet= "UTF-8">5         <title></title>6     </Head>7     <Body>8     </Body>9 Ten <Scripttype= "Text/javascript"> One     //NaN A     //Question 1: How to tell if an object is not a number -     //IsNaN () if the parentheses are filled with a number that returns false -     //Console.log (IsNaN ("abc")); the     //Note: NaN is also a data type on some data - Console.log (typeofNaN);// Number - Console.log (IsNaN (true)); //false - Console.log (IsNaN ("123")); //false +  -     //null and undefined +     //var result = (Null = = undefined); A     //Console.log (result); at     //undefined in the first place as a mistake to deal with. -     //NULL indicates that a value is null -     //when using, if a variable needs to clear the value, let the variable =null -  -     //How anonymous functions are called -     (function(i) { in Console.log ("hehe"); - Console.log (i); to     })(6); +      -     (function(){ the Console.log ("Heihei"); *     })(); $ </Script>Panax Notoginseng  - </HTML>

JS Knowledge Point Supplement

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