indexof用于数组去重

indexOf方法可以用于数组去重。它可以返回某个指定的元素在数组中首次出现的位置。使用indexOf和新建一个空的结果数组，可以对原数组进行遍历判断，如果元素不在结果数组中，则将其push进结果数组中，最后得到去重后的数组。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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