SOURCE

var arry = [1,2,3];
console.log(arry);
arry = [...arry,...arry];
console.log(arry);



//sort
arry = [2,1,3]
//排序
console.log("排序前："+arry)
console.log("排序："+arry.sort())

arry = [2,1,3]
Array.prototype.sort.call(arry);
console.log("排序："+arry)

arry = [2,1,3]
arry.sort.call(arry);
console.log("排序："+arry)