我將如何停止我的代碼在小部分和我的if和else語句不工作

我想我的代碼停止/停止/打破我把return;，我想它停止，我已經嘗試使用break如果有人可以幫助我，將不勝感激，我對JavaScript很新，所以如果我第一次沒有把事情做好，不要沮喪：D anyhelp會非常感激。我將如何停止我的代碼在小部分和我的if和else語句不工作

function InitAll() { 
    var name = prompt("What is your name?", ""); 
    document.write("Hello, " + name + " this is a little Javascript Activity!"); 
    var PromptAnswer = prompt("So, " + name + " do you like to play Soccer?", ""); 
    if (PromptAnswer == "yes" || "Yes" || "Yes!" || "yes!" || "yeah" || "yeah!" || "Yeah!") { 
     document.write("Cool, that's awesome, i play Soccer too!"); 
     var PromptAnswer2 = prompt("Well, even some people play Soccer and don't like it, do you like soccer?", ""); 
     if (PromptAnswer2 == "yes" || "Yes" || "Yes!" || "yes!" || "yeah" || "yeah!" || "Yeah!") { 
      document.write("Yeah, its pretty fun."); 
     } 
     if (PromptAnswer2 == "") { 
      return; 
     } 
     else { 
      document.write("Well, that's really too bad, but i guess if you don't like it, you dont like it. :D"); 
     } 
    } 
    else { 
     var PromptAnswer3 = prompt("Well, what sports do you like to play?", ""); 
     if (PromptAnswer3 == "football" || "Football") { 
      document.write("Haha yeah, football is pretty awesome, even though i'm a Javascript Script, my Creator can throw football pretty well. :D"); 
     } 
     else { 
      document.write(PromptAnswer3 + " is pretty cool."); 
     } 
    } 
}

來源

2011-11-27 Tristan McPherson

你的代碼有幾個問題。

提示功能可以返回null所以你可能想改變這一點：

if (PromptAnswer2 == "") { 
     return;

這樣：

if (!PromptAnswer2) { 
     return; 
    }

的return語句將完成該功能的執行，將控制權返回給無論什麼叫做功能。

這將檢查PromptAnswer2的null,""，undefined和其他幾件事。

其次，類似這樣的語句：

if (PromptAnswer == "yes" || "Yes" || "Yes!" || "yes!" || "yeah" || "yeah!" || "Yeah!")

必須這樣寫：

if (PromptAnswer == "yes" || PromptAnswer == "Yes" || PromptAnswer == "Yes!" || PromptAnswer == "yes!" || PromptAnswer == "yeah" || PromptAnswer == "yeah!" || PromptAnswer == "Yeah!")

或者甚至更好的去除不同情況的可能性：

PromptAnswer = PromptAnswer.toLowerCase(); 
if (PromptAnswer == "yes" || PromptAnswer == "yes!" || PromptAnswer == "yeah" || PromptAnswer == "yeah!")

，或者使用正則表達式：

if (PromptAnswer.match(/^(yes|yeah)!?$/i))

第三，您可能想知道在滿載文檔上的document.write()將清除當前文檔並開始編寫新文檔。通常情況下，處理javascript的事件通常不會發生。

來源

2011-11-27 06:30:09 jfriend00

+1，但我認爲它應該是'PromptAnswer2 ===「」' - 永遠不知道會發生什麼樣的野性轉換 –

@AdamRackis - 我的推薦是'if（！PromptAnswer2）'，因爲他們需要檢查也是null。 – jfriend00

我的壞 - 它遲到了:) –

我將如何停止我的代碼在小部分和我的if和else語句不工作

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