JS in the + number cast small example

Source: Internet
Author: User


1 <script>2 console.log (([]+{}). length); 3 </script>4

The output is actually:

Why would it be 15?

Because the + sign is coerced into a string under {}, the object is actually "{object}" plus two spaces in the middle of the object and "["

"]" These two curly braces are 12 letters of two object, so there are 15 characters appearing.

Let's switch to the following code output:

1  <script>2         console.log (([]+{}). length); 3         Console.log ([]+{}); 4     </script>

JS in the + number cast small example

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