Summary: implicit type conversion in Javascript, summary javascript Conversion

Summary: implicit type conversion in Javascript, summary javascript Conversion

JavaScript data types are divided into six types:null,undefined,boolean,string,number,object.objectIs the reference type, and the other five are the basic type or the original type.

For exampleNumber() , OrparseInt() ,parseFloat()All belong to the display type conversion (forced type conversion );

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

The value is automatically converted to a string.

Var a = 123; alert (a + '20140901'); // output 456

"+" Is the connector

The string is automatically converted to a number.

Var B = 20; // alert (B-'10'); // subtraction output 10 // alert (B * 2 ); // output 40 by multiplication // alert (B/2); // output 10 by Division // alert (B % 2) // return output

Type conversion between "++" and "-"

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

Type conversion of comparison Operators

Alert ('10'> 9) // output truealert ('10'> '9') // output false

Equal sign operator Conversion

Alert ('10' = 10) // output truealert ('10' = '10') // Output true

"!" Operator Conversion

Alert (! True); // outputs falsealert (! 100); // output falsealert (! 'Front-end web'); // outputs false

NaN is returned for conversions between other operators.

Alert ('web front-end developer'-10) // output NaN

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