I really don"t understand the operation principle of JS. I would like to ask my brother to explain a wave
.{}+[] ===0 true
[]+{} ===0 false
I really don"t understand the operation principle of JS. I would like to ask my brother to explain a wave
.{}+[] ===0 true
[]+{} ===0 false {} is a code block, so execute + [] . Because [] is an object, toPrimitive- > valueOf- > toString is ', resulting in +'= 0