Why does comparing {} and [] show an error? [duplicate]

问题

This question already has an answer here:

Why does {} == false throw an exception? (1 answer)

Closed 3 years ago.

On my free time, I was just playing with js console, I got an unexpected error:

js> [] == {}
false

js> {} == []
typein:5: SyntaxError: syntax error:

I tried with ===:

js> [] === {}
false
js> {} === []
typein:9: SyntaxError: syntax error:

Am thinking wrong here?

I tested this with Firefox, Chrome and jscore.

回答1:

That's because in the second case, {} is interpreted as a code block, rather than an object.

If you try ({}) == [] it works just fine.

js> ({}) == []
false
js> ({}) === []
false

来源：https://stackoverflow.com/questions/42185021/why-does-comparing-and-show-an-error