本文共 738 字，大约阅读时间需要 2 分钟。

/*         6.颠倒        reverse() */        var arr6=arr.reverse();        console.log(arr6);//["牧神记", "大王饶命", "搜神记", "诡秘之主"]        /* 7.排序(升序或降序)        sort() */        var arr7=[3,141,31,511,4,0]        var arr99=arr7.reverse();        var res=arr7.sort(function(a,b){
               return a-b;        })        console.log(res);//[0, 3, 4, 31, 141, 511] 数字升序        var res2=arr7.sort(function(a,b){
               return b-a;        })        console.log(res2);//[511, 141, 31, 4, 3, 0] 数字降序        var arr8=['e','t','a','h','w','he'];        var res3=arr8.sort();        console.log(res3);// ["a", "e", "h", "he", "t", "w"] 字母升序        var res4=arr8.sort().reverse();        console.log(res4);//["w", "t", "he", "h", "e", "a"] 字母降序

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