JavaScript Array lastIndexOf() 方法JavaScript Array 对象实例 查找数组元素 "Apple"出现的位置: var fruits = ["Banana", "Orange", "Apple", "Mango"]; var a = fruits.lastIndexOf("Apple"); a 输出结果: 2 以上实例输出结果意味着 "Apple" 位于数组中的第 2 个位置. 尝试一下 » ...
Topic: JavaScript / jQueryPrev|NextAnswer: Use the length PropertyYou can simply use the length property to select or get the last item in an array in JavaScript. This is the fastest and most cross-browser compatible solution.Let's take a look at an example to understand how it ...
javascript1min read In this tutorial, we are going to learn about how to get the last element in an array using JavaScript. reactgo.com recommended courseJavaScript - The Complete Guide 2023 (Beginner + Advanced) Consider we have an array with 4 elements like this. const users = ['sai',...
Javascript Array 对象 定义 lastIndexOf()方法返回可以在数组中找到给定元素的最后一个索引,如果不存在,则返回 -1。从fromIndex开始向后搜索数组。 该方法将从尾到头地检索数组中指定元素 item。开始检索的位置在数组的 start 处或数组的结尾(没有指定 start 参数时)。如果找到一个 item,则返回 item 从尾向前...
语法:array.lastIndexOf(item,start) 参数: 返回值:Num,没有找到返回 -1 解析: 1. 只有一个参数时,lastIndexOf从后往前找第一个item,找到就返回索引值。例如:arr.lastIndexOf(7) 从后往前找第一个7,索引值为6,所以结果就是6。
JavaScript array.lastIndexOf()方法返回可以在数组中找到给定元素的最后一个索引,如果不存在,则返回-1。从fromIndex开始向后搜索数组。 lastIndexOf() - 语法 array.lastIndexOf(searchElement[, fromIndex]); 1. searchElement - 要在数组中定位的元素。
JavaScript // Create an array. var ar = ["ab", "cd", "ef", "ab", "cd"]; // Determine the first location, in descending order, of "cd". document.write(ar.lastIndexOf("cd") + ""); // Output: 4 // Find "cd" in descending order, starting at index 2. document...
JavaScript Array findLast Method - Learn how to use the JavaScript Array findLast method to find the last element in an array that satisfies a provided testing function.
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JavaScript built-in: Array: findLast Global usage 94.53% + 0% = 94.53% IE ❌ 6 - 10: Not supported ❌ 11: Not supported Edge ❌ 12 - 96: Not supported ✅ 97 - 134: Supported ✅ 135: Supported Firefox ❌ 2 - 103: Not supported ✅ 104 - 136: Supported ✅ 137: ...