JavaScript Data type conversions

numeric types are automatically converted to strings when the data for a string, numeric type is additive.

When the IF condition is inside, the result is automatically converted to a Boolean type of data.

1 <script type= "Text/javascript" >2     var a = 1; 3     var b = ' 2 '; 4     Console.log (typeof(a+b));    //   string5 </script>

To force type conversions:

Conversion functions	Meaning
Number ()	Forcing other types of data to be converted to numeric type
parseint ()	Forcing other types of data to be converted to integers
Parsefloar ()	Force other types of data to be converted to number type (decimal)
String ()	Forcing other types of data to be converted into strings
Boolean ()	Convert other types of data to Boolean

1 <script type= "Text/javascript" >2     varnull; 3     Console.log (parseint (Vone));    // NaN 4 </script>

JavaScript operator.

1. Arithmetic operators

1 <script type= "Text/javascript" >2     var a = ten; 3     var b = a++; 4     var c =--b; 5     var d = C + + + + +; 6     var e = d-----D; 7     Alert (e);    // 2 8 </script>

2. Assignment operators

=,+=,-=,*=,/=,%=

3. Comparison operators

>,<,==,===,!=,!===,>=,<=

4. Logical operators

&&,| |,!

5. Ternary operators

Condition ==true? True:false

1 <script type= "Text/javascript" >2     var a = ten; 3     var b = Ten; 4     A+b = = 20? Alert (' True '): Alert (' false '); 5 </script>

JavaScript process statements

Note: If you use else if the else if is in the middle there is a space. The For in () loop can iterate over an array, an object

JavaScript Data type conversions