批改状态:合格
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<script>// 1.concat() 方法用于合并两个或多个数组。此方法不会更改现有数组,而是返回一个新数组。let arr=[1,2,3]let b=[3,4,5]console.log(arr.concat(b));// 2.lastIndexOf()方法从数组的末尾开始向前查找满足条件的索引console.log(arr.lastIndexOf(3));// 3.toString()方法会返回由数组中每个值的字符串形式拼接而成的一个以逗号分隔的字符串console.log(arr.toString());// 4.reverse()反向排序console.log(arr.reverse());// 5.includes() 方法返回一个布尔值,表示某个数组是否包含给定的值console.log(arr.includes(5));</script>
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