The conversion of each data type in JS

The data types in JS are: Object Null Undefined number String Boolean

Convert to Boolean type:boolean ();

　　Conversion rules:

　　　　

Data type	Value converted to True	Value converted to False
Boolean	True	False
String	Any non-empty string	"" (empty string)
Number	Any non-0 numeric value	0 and Nan
Undefined	Any object	Null
Object	No	Undefined

Convert to String type:string () and toString ();

conversion rule:

<script>    var a= "1";     var b= "true";     var c= "null";     var D;    Alert (String (a));     // "1"     alert (String (b));     // "true"     Alert (String (c));         // "NULL"     alert (String (d));     // "undefined"</script>

ToString (); method is not able to convert Null and Undefined

Convert to Floating point:parsefloat ();

　　

<script>    var num1 = parsefloat ("1234red")        //1234    var num2 = Parsefloat ("22.5")        //22.5    var num3 = parsefloat ("22.34.5")        //  22.34    var num4 = parsefloat ("0908.4")        //908.4</ Script>

Convert to Integer:parseint ();

<script>    var num1 = parseint ("1234red")    //1234    var num2 = parseint ("")            //NaN    var num3 = parseint ("22.5")        //      var num4 = parseint ("a")        //</script>

Non-numeric conversion to numeric number ();

<script>    var a= "1";    Alert (number (a));     var num1 = number ("Hello world");    // NaN    var num2 = number ("");                // 0    var num3 = number ("0000011");        //  One    var num4 = number ("true");            // 1</script>

　　　　　

The conversion of each data type in JS