return b-a;//這里寫(xiě)成b-a,與-1，有什么區(qū)別嗎?
<script type="text/javascript">
? ?function sortNum(a,b) {
? ? ?return b-a;//這里寫(xiě)成b-a,與-1，有什么區(qū)別嗎?
? ?}
var myarr = new Array("80","16","50","6","100","1");
document.write(myarr.sort(sortNum));
慕容8154426
2017-10-02
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2017-10-02
a-b是升序，b-a是降序