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This article mainly introduces JavaScript Boolean conversion values, date conversion to numbers and automatic string conversion methods related knowledge, detailed and easy to understand, simple and fast operation, with a certain reference value, I believe everyone read this JavaScript Boolean conversion values, date conversion to numbers and automatic string conversion methods articles will have some gains, let's take a look at it.

JavaScript Boolean to numeric, date to numeric, automatic string conversion

The global method Number() can also convert booleans to numbers.

Number(false) //returns 0

Number(true) //returns 1

Convert dates to numbers

The global method Number() can be used to convert dates to numbers.

d = new Date();

Number(d) //returns 1640921072728

The date method getTime() is the same.

d = new Date();

d.getTime() //returns 1640921072728

automatic type conversion

If JavaScript tries to manipulate a "wrong" data type, it tries to convert the value to the "right" type.

The results are not always what you expect:

5 + null //returns 5 because null is converted to 0

"5" + null //returns "5null" because null is converted to "null"

"5" + 2 //returns 52 because 2 was converted to "2"

"5" - 2 //returns 3 because "5" is converted to 5

"5" * "2" //returns 10 because "5" and "2" are converted to 5 and 2

Automatic string conversion

JavaScript automatically calls the variable's toString() function when you try to "export" an object or variable:

document.getElementById("demo")[xss_clean] = myVar;

//if myVar = {name:"Fjohn"} // toString is converted to "[object Object]"

//if myVar = [1,2,3,4] // toString converts to "1,2,3,4"

//if myVar = new Date() // toString converts to "Fri Dec 31 2021 11:24:32 GMT+0800"

Numbers and booleans are also converted, but not explicitly:

//if myVar = 123 // toString converts to "123"

//if myVar = true // toString converts to "true"

//if myVar = false // toString converts to "false"

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