indexOf 方法来查询数组中元素的索引。，，``javascript，let array = [1, 2, 3, 4, 5];，let index = array.indexOf(3); // 返回 2，``indexOf 方法来查询数组中元素的索引。，，``javascript，let array = [1, 2, 3, 4, 5];，let index = array.indexOf(3); // 返回 2，``Powered By Z-BlogPHP 1.7.3
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