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      2. 为什么 Javascript `if...else if` 不会以 `else` 结尾?

        Why would Javascript `if...else if` not end with an `else`?(为什么 Javascript `if...else if` 不会以 `else` 结尾?)
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                  本文介绍了为什么 Javascript `if...else if` 不会以 `else` 结尾?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  这是我正在使用的教程中的一段 JavaScript 代码.我不明白为什么它不以最后的 else 子句结尾;我认为这是一个规则.

                  Here is a snippet of JavaScript code from a tutorial I was working with. I don’t understand why it doesn’t end with a final else clause; I thought that was a rule.

                  var curScene = 0;
                  
                  function changeScene(decision) {
                    var message = "";
                  
                    if(curScene == 1) {
                      message = " welcome";
                    } else if (curScene == 2) {
                      message = " this is scene two";
                    } else if (curScene == 3) {
                      message = " this is scene three";
                    }
                  
                    document.getElementById("sceneimg").src = "scene" + curScene + ".png";
                  
                    if(message != ""){
                      alert(message);
                    }
                  }
                  

                  推荐答案

                  我认为它总是应该以else"结尾?

                  I thought it was always supposed to end with an "else"?

                  else 块是可选的.你可以有 if 而没有 else.

                  The else block is optional. You can have if without else.

                  这篇关于为什么 Javascript `if...else if` 不会以 `else` 结尾?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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