當提示「你有沒有發現......」運行，提示文本中包含的，而不是實際的文本「假」

Question

var route = 2; var name = prompt("'What is your name soldier?'"); 
 

 
\t if(route === 2) { 
 
\t \t if (prompt ("Well,. Did you find anything unusual out on your patrol? (Lie or truth?)".length === 3)) { 
 
\t \t alert("'No sir, nothing unusual.' you say.") 
 
\t } 
 
\t else 
 
\t \t alert("'Well, I did find a warehouse sir. It was emitting a strange sound, but I thought nothing of it.' you say") 
 
\t }

Answer 1

問題是這一行：

if (prompt ("Well,. Did you find anything unusual out on your patrol? (Lie or truth?)".length === 3)) { 

它使用一個布爾值作爲prompt()的值 - 例如如果（提示（字符串長度 === 3）{...由於屬性.length被傳遞到prompt()字符串訪問，而不是從提示的返回值。

要檢查的長度用戶輸入的字符串，將括號中的一個.length屬性進行訪問之前，像這樣：

if (prompt ("Well,. Did you find anything unusual out on your patrol? (Lie or truth?)").length === 3) { 

嘗試一下在這個片段中（點擊標記運行的代碼片段按鈕）：

var route = 2; var name = prompt("'What is your name soldier?'"); 
 

 
\t if(route === 2) { 
 
\t \t if (prompt ("Well,. Did you find anything unusual out on your patrol? (Lie or truth?)").length === 3) { 
 
\t \t alert("'No sir, nothing unusual.' you say.") 
 
\t } 
 
\t else 
 
\t \t alert("'Well, I did find a warehouse sir. It was emitting a strange sound, but I thought nothing of it.' you say") 
 
\t }