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Makao ya Kueleza

Mwongozo wa JS

  • Mwongozo wa JS (Kufuatia Aina)
  • Mwongozo wa JS (Kufuatia Historia ya Alfabeti)

JavaScript

  • JS Array
  • JS Boolean
  • JS Class
  • JS Tarehe
  • JS Kosa
  • JS Jumuisha
  • JS JSON
  • JS Map
  • JS Math
  • JS Number
  • JS Promise
  • JS RegExp
  • JS Set
  • JS Hati
  • JS Mwongozo
  • Vifaa vya MSWINGO ya JS
  • Kielewa cha Vifaa vya MSWINGO ya JS
  • JS Mafomu
  • JS Mazingira ya Matokeo

Window

  • Inayotaka Window Object
  • Window Console
  • Window History
  • Window Location
  • Window Navigator
  • Window Screen

HTML DOM

  • HTML Document
  • HTML Element
  • HTML Attribute
  • HTML Event
  • HTML Event Mwongozo
  • HTML Collection
  • HTML NodeList
  • HTML DOMTokenList
  • HTML Style

Web API

  • API Canvas
  • API Console
  • API Fetch
  • API Fullscreen
  • API Geolocation
  • API History
  • API MediaQueryList
  • API Storage
  • API Validation
  • API Web

HTML Mwongozo

  • <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>
  • <sub>
  • <summary>
  • <sup>
  • <table>
  • <tbody>
  • <td>
  • <tfoot>
  • <th>
  • <thead>
  • <tr>
  • <textarea>
  • <time>
  • </a></li> <li><a href="/sw/jsref/dom_obj_track.html" title="Mfano wa DOM Track wa HTML"><track></a></li> <li><a href="/sw/jsref/dom_obj_u.html" title="Mfano wa DOM Underline wa HTML"><u></a></li> <li><a href="/sw/jsref/dom_obj_ul.html" title="Mfano wa DOM Ul wa HTML"><ul></a></li> <li><a href="/sw/jsref/dom_obj_var.html" title="Mfano wa DOM Variable wa HTML"><var></a></li> <li><a href="/sw/jsref/dom_obj_video.html" title="Mfano wa DOM Video wa HTML"><video></a></li> </ul> <h2>其他参考手册</h2> <ul> <li><a href="/sw/jsref/obj_cssstyledeclaration.html" title="Mfano wa CSSStyleDeclaration">CSSStyleDeclaration</a></li> <li><a href="/sw/jsref/jsref_type_conversion.html" title="Mfano wa ujenzi wa 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 CodeW3C.com">Box 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 String substr() 方法</h1> <div class="prenextnav-ref"> <ul> <li> ukagombora hivi <a href="/sw/jsref/jsref_startswith.html" title="Method ya JavaScript String startsWith()">kaaanzaa kwa sababu ya ()</a></li> <li> Page ya hivi karibuni <a href="/sw/jsref/jsref_substring.html" title="Method ya JavaScript String substring()">substring()</a></li> <li> Rejea kwenye juu <a href="/sw/jsref/jsref_obj_string.html" title="Kitabu cha Matokeo cha JavaScript String">Kitabu cha Matokeo cha JavaScript String</a></li> </ul> </div> <div> <h2>定义和用法</h2> <p><code>substr()</code> 方法提取字符串的一部分。</p> <p><code>substr()</code> 方法从指定位置开始，并返回指定数量的字符。</p> <p><code>substr()</code> 方法不会更改原始字符串。</p> <p>如需从字符串末尾提取字符，请使用负数的起始位置。</p> <p class="tip"><span>提示：</span><code>substr()</code> 方法指定的是子串的开始位置和长度，它是 <code>substring()</code> 方法和 <code>slice()</code> 方法的一种有用的替代方法，后两者指定的都是起始字符的位置。</p> <h3>另请参阅：</h3> <p><a href="/sw/jsref/jsref_split.html" title="Method ya JavaScript String split()">split() 方法</a></p> <p><a href="/sw/jsref/jsref_slice_string.html" title="Method ya JavaScript String slice()">slice() 方法</a></p> <p><a href="/sw/jsref/jsref_substring.html" title="Method ya JavaScript String substring()">substring() 方法</a></p> </div> <div> <h2>实例</h2> <h3>例子 1</h3> <p>从文本中提取子字符串：</p> <pre class="language-js"> let text = "Hello world!"; let result = text.substr(1, 4);" </pre> <p class="tiy"><a target="_blank" href="/sw/tiy/t.html?f=jsck_substr_1">ina uadilifu</a></p> <h3>例子 2</h3> <p>从位置 2 开始：</p> <pre class="language-js"> let result = text.substr(2); </pre> <p class="tiy"><a target="_blank" href="/sw/tiy/t.html?f=jsck_substr_2">ina uadilifu</a></p> <h3>例子 3</h3> <p>只提取第一个：</p> <pre class="language-js"> let result = text.substr(0, 1); </pre> <p class="tiy"><a target="_blank" href="/sw/tiy/t.html?f=jsck_substr_3">ina uadilifu</a></p> <h3>例子 4</h3> <p>只提取最后一个：</p> <pre class="language-js"> let result = text.substr(text.length-1, 1); </pre> <p class="tiy"><a target="_blank" href="/sw/tiy/t.html?f=jsck_substr_4">ina uadilifu</a></p> <h3>例子 5</h3> <p>提取最后六个：</p> <pre class="language-js"> let result = text.substr(-5, 5); </pre> <p class="tiy"><a target="_blank" href="/sw/tiy/t.html?f=jsck_substr_5">ina uadilifu</a></p> </div> <div> <h2>ina uadilifu</h2> <pre><i>string</i>.substr(<i>kuanza</i>, <i>uwezo wa kina</i>)</pre> <h3>makosa</h3> <table class="dataintable"> <tr> <th style="width: 25%;">makosa</th> <th>kuwasiliana</th> </tr> <tr> <td><i>kuanza</i></td> <td> <p>ina uadilifu. Ina ujenzi wa kina.</p> <p>ina uadilifu. Ina ujenzi wa kina.</p> <p>ina uadilifu, substr() itakuwa kama chakula cha upinde. <i>kuanza</i> kwanza kina na indeksi ya 0.</p> <p>ina uadilifu, substr() itakuwa kama chakula cha upinde. <i>kuanza</i> ina uadilifu, substr() itakaa kuanza kutumia mabaki ya chakula cha upinde.</p> </td> </tr> <tr> <td><i>uwezo wa kina</i></td> <td> <p>ina uadilifu. Ina ujenzi wa mabaki ya chakula cha upinde.</p> <p>ina uadilifu. Ina ujenzi wa kipindi cha chakula cha upinde.</p> </td> </tr> </table> <h3>uchaguo wa kifo</h3> <table class="dataintable"> <tr> <th style="width: 25%;">aina</th> <th>kuwasiliana</th> </tr> <tr> <td>uchaguo</td> <td> <p>ina ujenzi wa sehemu ya msaada.</p> <p>ina ujenzi 0 au ina uadilifu, itakuwa kama chakula cha upinde.</p> </td> </tr> </table> </div> <div> <h2>mzungu wa kawaida</h2> <p>substr() ni muhimu kwa ECMAScript1 (ES1).</p> <p>Wote wengi wa mzungu wameongea kwa kawaida ES1 (JavaScript 1997):</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>mzungu</td> <td>mzungu</td> <td>mzungu</td> <td>mzungu</td> <td>mzungu</td> <td>mzungu</td> </tr> </table> </div> <div> <h2>masomo yenye muundo</h2> <p><a href="/sw/js/js_strings.html" title="Mfano wa JavaScript String">Mfano wa JavaScript String</a></p> <p><a href="/sw/js/js_string_methods.html" title="Method ya JavaScript String">Method ya JavaScript String</a></p> <p><a href="/sw/js/js_string_search.html" title="Tafuta kwa JavaScript String">Tafuta kwa JavaScript String</a></p> </div> <div class="prenextnav-ref"> <ul> <li> ukagombora hivi <a href="/sw/jsref/jsref_startswith.html" title="Method ya JavaScript String startsWith()">kaaanzaa kwa sababu ya ()</a></li> <li> Page ya hivi karibuni <a href="/sw/jsref/jsref_substring.html" title="Method ya JavaScript String substring()">substring()</a></li> <li> Rejea kwenye juu <a href="/sw/jsref/jsref_obj_string.html" title="Kitabu cha Matokeo cha JavaScript String">Kitabu cha Matokeo cha JavaScript String</a></li> </ul> </div><div style="background-color:#fcfdf8; padding:0;"> </div> </div> <!-- maincontent end --> <div id="sidebar"> <div><h3><center> Kifaa cha kuuza </center><h3> <h5 id="tools_reference"><a href="/sw/jsref/index.html">Kitabu cha Matokeo cha JavaScript na HTML DOM</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">Majadiliano ya JavaScript</a></h5> <h5 id="tools_tutorial"><a href="/sw/js/index.html">Mafunzo ya JavaScript</a></h5> </div> <div><h3><center> Mwongozo wa mshambulizi </center><h3> <div id="sbtg"> <script src="/myjs/zzsr.js"></script> </div> </div> </div> <div id="footer"> <p id="p1"> Matokeo ya CodeW3C.com yanaonyeshwa kwa mafunzo na michezo, hatukubali kumtaka kweli wa matokeo. 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