sort()问题

Question

<script type="text/javascript">function sortNumber(a,b){return a - b}var arr = new Array(3)arr[0] = "10";arr[1] = "5";arr[2] = "4";document.write(arr + "<br />");document.write(arr.sort(sortNumber));</script>sortNumber(a,b){return a - b}a-b是什么意思呀 谢谢

Answer 1

sort()函数通过传入比较函数来排序，在这里return a - b;是说明按从小到大顺序排列