sort()

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sort():(The function will change the original array)
1.

<script>    var arr = [1,3,2,5,4];    console.log(arr.sort());    //[1,2,3,4,5]    console.log(arr);    //[1,2,3,4,5]</script>

2.

<script>    var arr = [1,3,2,5,4];    console.log(arr.sort(function(a,b){return a-b;}));    //[1,2,3,4,5]     console.log(arr.sort(function(a,b){return b-a;}));    //[5,4,3,2,1]</script>

3.items appear at random

<script>    var arr = [1,3,2,5,4];    console.log(arr.sort(function(){return Math.random()-0.5}));    //[1, 3, 5, 4, 2]、[3, 4, 5, 2, 1]...</script>
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