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Jadwali cha Kufikia
Kitabu cha Tafsiri cha JS
Kitabu cha Tafsiri cha JS (kufikia kwa kikundi)
Kitabu cha Tafsiri cha JS (kufikia kwa harakati ya herufi)
JavaScript
Mfano wa JS Array
Mfano wa JS Boolean
Mfano wa JS Class
Mfano wa JS Date
Mfano wa JS Error
Mfano wa JS Global
Mfano wa JS JSON
Mfano wa JS Map
Mfano wa JS Math
Mfano wa JS Number
Mfano wa JS Promise
Mfano wa JS RegExp
Mfano wa JS Set
Mfano wa JS String
Mfano wa JS
Mafanikio ya JS
Mwongozo wa Mafanikio ya JS
Matangalizi ya JS
Makundi ya Tafsiri ya JS
Window
Kifaa cha Window
Window Console
Window History
Window Location
Window Navigator
Window Screen
Mfano wa HTML DOM
Mfano wa HTML Document
Mfano wa HTML Element
Mfano wa HTML Attribute
Mfano wa HTML Event
Mfano wa HTML Event
Mifano wa HTML Collection
Mifano wa HTML NodeList
Mifano wa HTML DOMTokenList
Mifano wa HTML
API ya Web
API ya Canvas
API ya Console
API ya Fetch
API ya Fullscreen
API ya Geolocation
API ya History
API ya MediaQueryList
API ya Storage
API ya Validation
API ya Web
Mfano wa HTML
<a>
<abbr>
<address>
<area>
<article>
<aside>
<audio>
<b>
<base>
<bdo>
<blockquote>
<body>
<br>
<button>
<canvas>
<caption>
<cite>
<code>
<col>
<colgroup>
<datalist>
<dd>
<del>
<details>
<dfn>
<dialog>
<div>
<dl>
<dt>
<em>
<embed>
<fieldset>
<figcaption>
<figure>
<footer>
<form>
<head>
<header>
<h1> - <h6>
<hr>
<html>
<i>
<iframe>
<img>
<ins>
<input> button
<input> checkbox
<input> color
<input> date
<input> datetime
<input> datetime-local
<input> email
<input> file
<input> hidden
<input> image
<input> month
<input> number
<input> password
<input> radio
<input> range
<input> reset
<input> search
<input> submit
<input> text
<input> time
<input> url
<input> week
<kbd>
<label>
<legend>
<li>
<link>
<map>
<mark>
<menu>
<menuitem>
<meta>
<meter>
<nav>
<object>
<ol>
<optgroup>
<option>
<output>
<p>
<param>
<pre>
<progress>
<q>
<s>
<samp>
<script>
<section>
<select>
<small>
<source>
<span>
<strong>
</a></li> <li><a href="/sw/jsref/dom_obj_time.html" title="HTML DOM Time muundo"><time></a></li> <li><a href="/sw/jsref/dom_obj_title.html" title="HTML DOM Title muundo"><title></a></li> <li><a href="/sw/jsref/dom_obj_track.html" title="HTML DOM Track muundo"><track></a></li> <li><a href="/sw/jsref/dom_obj_u.html" title="HTML DOM Underline muundo"><u></a></li> <li><a href="/sw/jsref/dom_obj_ul.html" title="HTML DOM Ul muundo"><ul></a></li> <li><a href="/sw/jsref/dom_obj_var.html" title="HTML DOM Variable muundo"><var></a></li> <li><a href="/sw/jsref/dom_obj_video.html" title="HTML DOM Video muundo"><video></a></li> </ul> <h2>其他参考手册</h2> <ul> <li><a href="/sw/jsref/obj_cssstyledeclaration.html" title="CSSStyleDeclaration muundo">CSSStyleDeclaration</a></li> <li><a href="/sw/jsref/jsref_type_conversion.html" title="Muungano wa Aina ya JavaScript">JS 类型转换</a></li> </ul> </div> <div><h3><center> 选修课 </center><h3> <h2>课程推荐：</h2> <ul> <li><a href="/sw/howto/index.html" title="Box ya Mabaya ya CodeW3C.com">Box ya Mabaya ya CodeW3C.com</a></li> </ul> </div> </div> <div id="maincontent"> <div class="idea"> <a href="/"><button>English</button></a> <a href="/zh/"><button>中文</button></a> <a href="/oldzh/"><button>繁體中文</button></a> <a href="/ru/"><button>Русский</button></a> <a href="/fr/"><button>Français</button></a> <a href="/de/"><button>Deutsch</button></a> <a href="/es/"><button>Español</button></a> <a href="/pt/"><button>Português</button></a> <a href="/ja/"><button>日本語</button></a> <a href="/ko/"><button>한국어</button></a> <a href="/it/"><button>Italiano</button></a> <a href="/ar/"><button>عربي</button></a> <a href="/hi/"><button>हिंदी</button></a> <a href="/bn/"><button>বাংলা</button></a> <a href="/ms/"><button>Bahasa Malaysia</button></a> <a href="/my/"><button>မြန်မာ</button></a> <a href="/vi/"><button>Tiếng Việt</button></a> <a href="/th/"><button>ภาษาไทย</button></a> <a href="/lo/"><button>ລາວ</button></a> <a href="/id/"><button>Bahasa Indonesia</button></a> <a href="/ur/"><button>اردو</button></a> <a href="/ha/"><button>Hausa</button></a> <a href="/pl/"><button>Język polski</button></a> <a href="/pa/"><button>ਪੰਜਾਬੀ</button></a> <a href="/sv/"><button>Svenska</button></a> <a href="/da/"><button>Dansk</button></a> <a href="/nl/"><button>Nederlands</button></a> <a href="/tr/"><button>Türkçe</button></a> <a href="/fi/"><button>suom.</button></a> <a href="/el/"><button>Ελληνικά</button></a> <a href="/fa/"><button>فارسی</button></a> <a href="/sw/"><button>Kiswahili</button></a> <a href="/te/"><button>తెలుగు</button></a> <a href="/tl/"><button>wikang Galu</button></a> </div> <h1>JavaScript Array indexOf()</h1> <div class="prenextnav-ref"> <ul> <li> Rejea kwenye chini <a href="/sw/jsref/jsref_includes_array.html" title="Method ya Array includes() ya JavaScript">includes()</a></li> <li> Pya kati <a href="/sw/jsref/jsref_isarray.html" title="Method ya isArray() ya Array ya JavaScript">isArray()</a></li> <li> Rejea kwenye juu <a href="/sw/jsref/jsref_obj_array.html" title="Mwongozo wa JavaScript Array wa Matokeo">Mwongozo wa JavaScript Array wa Matokeo</a></li> </ul> </div> <div> <h2>定义和用法</h2> <p><code>indexOf()</code> 方法在数组中搜索指定项目，并返回其位置。</p> <p>搜索将从指定位置开始，如果未指定开始位置，则从头开始，并在数组末尾结束搜索。</p> <p>如果未找到该项目，则 <code>indexOf()</code> 返回 -1。</p> <p>如果该项目出现多次，则 <code>indexOf()</code> 方法返回第一次出现的位置。</p> <p class="note"><span>注释：</span>第一项的位置为 0，第二项的位置为 1，依此类推。</p> <p class="tip"><span>提示：</span>如果您想从尾到头搜索，请使用 <code><a href="/sw/jsref/jsref_lastindexof_array.html" title="Method ya lastIndexOf() ya Array ya JavaScript">lastIndexOf()</a></code> 方法。</p> </div> <div> <h2>实例</h2> <h3>例子 1</h3> <p>在数组中搜索 "Apple" 项：</p> <pre class="language-js"> var fruits = ["Banana", "Orange", "Apple", "Mango"]; var a = fruits.indexOf("Apple"); </pre> <p class="tiy"><a target="_blank" href="/sw/tiy/t.html?f=jsck_indexof_array_1">亲自试一试</a></p> <h3>例子 2</h3> <p>在数组中搜索项目 "Apple"，从位置 4 开始搜索：</p> <pre class="language-js"> var fruits = ["Banana", "Orange", "Apple", "Mango", "Banana", "Orange", "Apple"]; var a = fruits.indexOf("Apple", 4); </pre> <p class="tiy"><a target="_blank" href="/sw/tiy/t.html?f=jsck_indexof_array_2">亲自试一试</a></p> </div> <div> <h2>语法</h2> <pre><i>array</i>.indexOf(<i>item</i>, <i>start</i>)</pre> <h3>参数值</h3> <table class="dataintable"> <tr> <th style="width: 25%;">参数</th> <th>描述</th> </tr> <tr> <td><i>item</i></td> <td>必需。要搜索的项目。</td> </tr> <tr> <td><i>start</i></td> <td>可选。从哪里开始搜索。负值给定的位置将从结尾计数，然后搜索到最后。</td> </tr> </table> </div> <div> <h2>技术细节</h2> <table class="definition-usage"> <tr> <th>返回值：</th> <td>数值，表示指定项目的位置，否则 -1。</td> </tr> <tr> <th style="width: 25%;">Tokea ya JavaScript:</th> <td>ECMAScript 5</td> </tr> </table> </div> <div> <h2>Inasaa ya Kifungaji</h2> <p>Wote wana inasaa kwa upofupi <code>indexOf()</code> Methodi:</p> <table class="browser-support"> <tr> <th class="bsChrome">Chrome</th> <th class="bsIE">IE</th> <th class="bsEdge">Edge</th> <th class="bsFirefox">Firefox</th> <th class="bsSafari">Safari</th> <th class="bsOpera">Opera</th> </tr> <tr> <td>Chrome</td> <td>IE</td> <td>Edge</td> <td>Firefox</td> <td>Safari</td> <td>Opera</td> </tr> <tr> <td>Inasaa</td> <td>9.0</td> <td>Inasaa</td> <td>Inasaa</td> <td>Inasaa</td> <td>Inasaa</td> </tr> </table> </div> <div> <h2>Sayari ya Kuhusu</h2> <p>Mafunzo:<a href="/sw/js/js_arrays.html">JavaScript Array</a></p> <p>Mafunzo:<a href="/sw/js/js_array_const.html">JavaScript Const ya Array</a></p> <p>Mafunzo:<a href="/sw/js/js_array_methods.html">JavaScript Methodi ya Array</a></p> <p>Mafunzo:<a href="/sw/js/js_array_sort.html">Muungano wa fursa za orodha ya JavaScript</a></p> <p>Mafunzo:<a href="/sw/js/js_array_iteration.html">Muungano wa Array ya JavaScript</a></p> <p>Makala:<a href="/sw/jsref/jsref_lastindexof.html">Method ya lastIndexOf ya Array</a></p> </div> <div class="prenextnav-ref"> <ul> <li> Rejea kwenye chini <a href="/sw/jsref/jsref_includes_array.html" title="Method ya Array includes() ya JavaScript">includes()</a></li> <li> Pya kati <a href="/sw/jsref/jsref_isarray.html" title="Method ya isArray() ya Array ya JavaScript">isArray()</a></li> <li> Rejea kwenye juu <a href="/sw/jsref/jsref_obj_array.html" title="Mwongozo wa JavaScript Array wa Matokeo">Mwongozo wa JavaScript Array wa Matokeo</a></li> </ul> </div><div style="background-color:#fcfdf8; padding:0;"> </div> </div> <!-- maincontent end --> <div id="sidebar"> <div><h3><center> Kitengo cha vifaa </center><h3> <h5 id="tools_reference"><a href="/sw/jsref/index.html">Mwongozo wa JavaScript na HTML DOM wa Matokeo</a></h5> <h5 id="tools_example"><a href="/sw/js/js_examples.html">Mifano ya JavaScript</a></h5> <h5 id="tools_quiz"><a href="/sw/js/js_quiz.html">Muafikia wa JavaScript</a></h5> <h5 id="tools_tutorial"><a href="/sw/js/index.html">Mafunzo ya JavaScript</a></h5> </div> <div><h3><center> Viungo vya mshabiki </center><h3> <div id="sbtg"> <script src="/myjs/zzsr.js"></script> </div> </div> </div> <div id="footer"> <p id="p1"> Muungano wa CodeW3C.com inatumika kwa mafunzo na mafanikio, hatuambatilika kweli ya mafanikio. 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