Summary of implicit type conversion in Javascript

JavaScript data types are divided into six types, namely null , undefined , boolean , string , number , object . object is a reference type, and the other five are basic types or primitive types.

For example, if it is Number() , parseInt() , and parseFloat() , they all belong to display type conversion (cast type conversion);

In this section, we will take a look at implicit type conversion (automatic conversion).

Automatically convert numeric values to strings

 var a = 123;alert(a+'456'); // Output 123456

"+" sign is the connection character

Automatically convert strings to numbers

 var b = 20;//alert(b-'10'); // Subtraction output 10//alert(b*2); // Multiplication output 40//alert(b/2); // Division output 10//alert(b%2) // Find the remaining output

Type conversion of "++" and ""

 var c = '10';c++;alert(c); // Output 11var d = '10';d--;alert(d); // Output 9

Comparison operator type conversion

 alert('10' > 9) // Output truealert('10' > '9') // Output false

Conversion of equal sign operator

 alert('10' == 10) // Output truealert('10' == '10') // Output true

Conversion of the "!" operator

 alert(!true); // Output falsealert(!100); // Output falsealert(!'Web front-end development'); // Output false

Conversion between operators and other conversions return NaN

 alert('Web front-end development'-10) // Output NaN

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