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其他参考手册

CSSStyleDeclaration JS 类型转换


JavaScript 数组 lastIndexOf() 方法


实例

在数组中搜索 "Apple" 项:

var fruits = ["Banana", "Orange", "Apple", "Mango"];
var a = fruits.lastIndexOf("Apple");
亲自试一试 »

页面下方有更多实例。


定义和用法

lastIndexOf() 方法在数组中搜索指定项目,并返回其位置。

搜索将从指定位置开始,如果未指定开始位置,则从末尾开始,并在数组的开头结束搜索。

如果未找到该项目,则 lastIndexOf() 方法返回 -1。

如果要搜索的项目不止一次出现,lastIndexOf() 方法将返回最后一次出现的位置。

提示:如果要从头到尾搜索,使用 indexOf() 方法。


浏览器支持

表中的数字表示支持该方法的第一个浏览器版本。

方法
lastIndexOf() Yes 9.0 Yes Yes Yes

语法

array.lastIndexOf(item, start)

参数值

参数 描述
item 必需。要搜索的项目。
start 可选。从哪里开始搜索。负值的给定的位置从末尾计数,然后搜索到开头。


技术细节

返回值: 数值,表示指定项目的位置,否则 -1。
JavaScript 版本: ECMAScript 5

更多实例

实例

在数组中搜索 "Apple" 项:

var fruits = ["Banana", "Orange", "Apple", "Mango", "Banana", "Orange", "Apple"];
var a = fruits.lastIndexOf("Apple");
亲自试一试 »

实例

在数组中搜索项目 "Apple",从位置 4 开始搜索:

var fruits = ["Banana", "Orange", "Apple", "Mango", "Banana", "Orange", "Apple"];
var a = fruits.lastIndexOf("Apple", 4);
亲自试一试 »

相关页面

JavaScript 教程: JavaScript 数组

JavaScript 教程: JavaScript 数组迭代