为什么{} + []与（{} + []）不同？ [英] Why is {}+[] different from ({}+[])?
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问题描述
我最近惊慌地发现以下内容：
I was recently alarmed to discover the following:
> {}+[]
0
> ({}+[])
"[object Object]"
> {}+[]+1
1
> ({}+[])+1
'[object Object]1'
> {}+[] == ({}+[])
false
为什么用括号括起来改变它的类型？
Why does wrapping something in parenthesis change its type?
推荐答案
{} + [] 是一个空块，后跟一个带有一元 + 运算符的数组，基本上是 + [] 哪个是0，
{} + [] is an empty block followed by a an array with a unary + operator, which is essentially, which is +[] which is 0,
（{} + []）是一个文字对象加上一个文字数组，两者都是转换为字符串，对象的字符串值是[object Object]加上空数组的字符串值，因此你看到的结果。
({} + []) is a literal object plus a literal array, both get converted into strings, the string value of an object is "[object Object]" plus the string value of an empty array which is "", hence the result you see.
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