为什么`function test(){} + 1;`的输出是1？
Why is the output of `function test(){} + 1;` is 1?
为什么下面代码的输出是1
function test(){} + 1; // output: 1
由于automatic semicolon insertion，该代码实际处理为：
function test(){}; + 1;
那就是 unary plus operator, not the addition operator。
function test() or {} here is not an Object, its en empty statement and JS Cannot convert object to primitive value and find the safe route and convert this statement value to false.
{} + 1 = 1 because (false + 1) = always 1.
为什么下面代码的输出是1
function test(){} + 1; // output: 1
由于automatic semicolon insertion，该代码实际处理为：
function test(){}; + 1;
那就是 unary plus operator, not the addition operator。
function test() or {} here is not an Object, its en empty statement and JS Cannot convert object to primitive value and find the safe route and convert this statement value to false.
{} + 1 = 1 because (false + 1) = always 1.