使用Math.max(… []),数组被视为通过扩展运算符的参数集合.由于数组为空,这与不带参数的调用相同.
根据docs产生的 – 无穷大

If no arguments are given,the result is -Infinity.

一些示例显示调用与数组的区别：

console.log(+[]); //0    [] -> '' -> 0
console.log(+[3]); //3    [] -> '3' -> 3
console.log(+[3,4]); //Nan 
console.log(...[3]); //3
console.log(...[3,4]); //3 4 (the array is used as arguments)
console.log(Math.max([])); //0  [] is converted to 0
console.log(Math.max()); // -infinity:  default without arguments
console.log(Math.max(...[])); // -infinity
console.log(Math.max([3,4])); //Nan
console.log(Math.max(...[3,4])); //4