如何通过js获取到数组的下标值

Question

如题所述

Answer 1

<script type="text/javascript">
var arr = [1,2,3,4,5,6,2,4,55];
for(var i=0; $i<arr.length;i++){
console.log(i);
}
</script>本回答被网友采纳

Answer 2

var arr = [1,2,3,4,5,6];
alert(arr.length);本回答被网友采纳