uniapp下标最后一个

在uniapp中，可以使用数组的length属性来获取最后一个元素的下标。由于数组的下标从0开始计数，所以最后一个元素的下标是数组长度减1。例如，如果一个数组名为arr，那么最后一个元素的下标可以通过arr.length - 1来获取。<span class="em">1</span><span class="em">2</span>
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