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js 求最大最小值

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        *{padding:0;margin:0;}
li{list-style:none;}
</style>
</head>
<body>

<script>
    var arr=[999,992,997,22,38,8,923,232,1023];
    var minArr=9999;
    var maxArr=1;
    var minIndex=0;
    var maxIndex=0;
    for(var i=0;i<arr.length;i++){
if(arr[i] < minArr){
            minArr=arr[i];
            minIndex=i;
        }
    }
    alert(minArr+'+'+minIndex);
    for(var i=0;i<arr.length;i++){
if(arr[i] > maxArr){
            maxArr=arr[i];
            maxIndex=i;
        }
    }
    alert(maxArr+'+'+maxIndex);
</script>
</body>
</html>      

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