JavaScript Boolean conversion value, date conversion to number and automatic string conversion method
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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