The usage of tostring() and valueof() and the difference between them

Basically, all JS data types have two methods, valueOf and toString, except null. The two of them solve the problem of javascript value operation and display.

1. The usage is as follows:

toString() method: Returns the string representation of the object.

function functionname( ) { [native code] }

valueOf() method: Returns the original value of the specified object.

2. Common points and differences between the two:

Common points: In JavaScript, the toString() method and The valueOf() method is automatically called when outputting the object.

The difference: when the two coexist, in numerical operations, valueOf is called first, and in string operations, toString is called first.

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