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This article introduces the relevant knowledge of "what is the type of automatic conversion of JavaScript". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Automatic conversion type

When JavaScript attempts to manipulate a "wrong" data type, it is automatically converted to the "correct" data type.

The following output is not what you expected:

5 + null / / returns 5 null converted to 0

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

"5" + 1 / / returns "51" 1 to convert to "1"

"5"-1 / / return 4 "5" converted to 5

Automatically convert to a string

When you try to output an object or a variable, JavaScript automatically calls the variable's toString () method:

Document.getElementById ("demo") [xss_clean] = myVar

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

MyVar = [1, 2, 3, 4] / / toString is converted to "1, 2, 3, 4"

MyVar = new Date () / / toString converted to "Fri Jul 18 2014 09:08:55 GMT+0200"

Numbers and Boolean values are also often converted to each other:

MyVar = 123 / / toString converted to "123"

MyVar = true / / toString converted to "true"

MyVar = false / / toString converted to "false"

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