sort方法要注意的地方

　　　　 <script>
            var arr=[2,3,43,5,2362,62,672,76,78,231,52,1,35,556,7,7,89,0];
            var arr2=arr;
            arr2.sort(function(a,b){
                return a-b;
            })
            console.log("arr="+arr);
            console.log("arr2="+arr2);
        </script>

结果：

arr=0,1,2,3,5,7,7,35,43,52,62,76,78,89,231,556,672,2362
arr2=0,1,2,3,5,7,7,35,43,52,62,76,78,89,231,556,672,2362

说明了：

sort方法会改变原来的数组