function findShort(s){         return Math.min(...s.split(" ").map (s => s.length));         } var p1 = findShort("bitcoin take over the world maybe who knows perhaps"); //3 var p2 = findShort("turns out random test cases are easier than writing out basic ones") //3  console.log(p1); //3 console.log(p2); //3

找出最短的长度的字符串，这里的...起到什么作用？这好像不是类数组把。。