需求查找num在arr中升序排序的索引getIndexToIns([2, 20, 10], 19) should return 2 function getIndexToIns(arr, num) { var index = arr.sort((a, b) => a - b) .findIndex(a => num <= a); return index === -1 ? arr.length : index;}getIndexToIns([40, 60], 500);
ES6箭頭函數(shù)，以下實(shí)例中雙箭頭如何理解？
冉冉說(shuō)
2018-12-12 16:12:07
