JS模拟实现方法重载示例

本文实例讲述了JS模拟实现方法重载。分享给大家供大家参考，具体如下：

方法中，不能像C#方法能实现重载，但是我们可以通过js中的arguments来实现js方法的重载。

下面给出html实例：

JS<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>的重载@H_<a href="https://www.jb51.cc/tag/403/" target="_blank" class="keywords">403</a>_9@ <script> function testFun1(arm1){ /// <summary> /// JS重载测试被<a href="https://www.jb51.cc/tag/diaoyong/" target="_blank" class="keywords">调用</a><a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>1 /// </summary> /// <param name="arm1"></param> alert(arm1); } function testFun2(arm1,arm2){ /// <summary> /// JS重载测试被<a href="https://www.jb51.cc/tag/diaoyong/" target="_blank" class="keywords">调用</a><a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>2 /// </summary> /// <param name="arm1"></param> /// <param name="arm2"></param> alert(arm1+','+arm2); } function testFun3(arm1,arm2,arm3){ /// <summary> /// JS重载测试被<a href="https://www.jb51.cc/tag/diaoyong/" target="_blank" class="keywords">调用</a><a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>3 /// </summary> /// <param name="arm1"></param> /// <param name="arm2"></param> /// <param name="arm3"></param> alert(arm1+','+arm2+','+arm3); } function testFun4(arm1,arm3,arm4){ /// <summary> /// JS重载测试被<a href="https://www.jb51.cc/tag/diaoyong/" target="_blank" class="keywords">调用</a><a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>4 /// </summary> /// <param name="arm1"></param> /// <param name="arm2"></param> /// <param name="arm3"></param> /// <param name="arm4"></param> alert(arm1+','+arm3+','+arm4); } function testFun(arm1,arm4){ /// <summary> /// JS重载测试<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a> /// </summary> /// <param name="arm1"></param> /// <param name="arm2"></param> /// <param name="arm3"></param> /// <param name="arm4"></param> if(arguments.length==1){ alert('我是JS的重载<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>，该<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>的参数一共有'+arguments.length+'个。\n参数1：'+arguments[0]); //这里既是执行重载的<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a> testFun1(arm1); } else if(arguments.length==2){ alert('我是JS的重载<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>，该<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>的参数一共有'+arguments.length+'个。\n参数1：'+arguments[0]+'\n参数2：'+arguments[1]); //这里既是执行重载的<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a> testFun2(arm1,arm2); } else if(arguments.length==3){ alert('我是JS的重载<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>，该<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>的参数一共有'+arguments.length+'个。\n参数1：'+arguments[0]+'\n参数2：'+arguments[1]+'\n参数3：'+arguments[2]); //这里既是执行重载的<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a> testFun3(arm1,arm3); } else if(arguments.length==4){ alert('我是JS的重载<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>，该<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>的参数一共有'+arguments.length+'个。\n参数1：'+arguments[0]+'\n参数2：'+arguments[1]+'\n参数3：'+arguments[2]+'\n参数4：'+arguments[3]); //这里既是执行重载的<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a> testFun4(arm1,arm4); } //多个参数以此类推 } //初始化执行的<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a> window.onload=function(){ testFun(1,2,3); } </script> </head> <body> JS<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>的重载 </body> </html> </pre> </div> <p>更多关于JavaScript相关<a href="https://www.jb51.cc/tag/neirong/" target="_blank" class="keywords">内容</a>感兴趣的读者可查看本站专题：《<a target="_blank" href="//www.jb51.cc/Special/85.htm">javascript面向对象入门教程</a>》、《<a target="_blank" href="//www.jb51.cc/Special/297.htm">JavaScript数据结构与算法技巧总结</a>》、《<a target="_blank" href="//www.jb51.cc/Special/119.htm">JavaScript数学运算用法总结</a>》、《<a target="_blank" href="//www.jb51.cc/Special/502.htm">JavaScript切换特效与技巧总结</a>》、《<a target="_blank" href="//www.jb51.cc/Special/472.htm">JavaScript查找算法技巧总结</a>》、《<a target="_blank" href="//www.jb51.cc/Special/462.htm">JavaScript动画特效与技巧汇总</a>》、《<a target="_blank" href="//www.jb51.cc/Special/439.htm">JavaScript错误与调试技巧总结</a>》及《<a target="_blank" href="//www.jb51.cc/Special/281.htm">JavaScript遍历算法与技巧总结</a>》</p> <p>希望本文所述对大家JavaScript程序设计有所帮助。</p><i class="glyphicon glyphicon-link"></i> 原文链接：https://www.f2er.com/js/46838.html</div> <div class="topcard-tags"><a href="https://www.f2er.com/tag/fangfazhongzai/" class="tag_link" target="_blank">方法重载</a></div> <ul class="list-group"> <li class="list-group-item"><a href="https://www.f2er.com/js/46841.html" title="AngularJS基础 ng-submit 指令简单示例">上一篇：AngularJS基础 ng-submit 指令简单</a><a href="https://www.f2er.com/js/46837.html" title="深入浅出讲解ES6的解构" class="text-muted pull-right">下一篇：深入浅出讲解ES6的解构</a> </li> </ul> </div> </div> </div>  <div class="row row-sm"> <div class="col-sm-12 col-md-12 col-lg-12"> <div class="card"> <ins class="adsbygoogle" style="display:block" data-ad-format="autorelaxed" data-ad-client="ca-pub-4605373693034661" data-ad-slot="9144498553"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); 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