有沒有可能在javascript中添加切換語句的情況？

Question

我的問題除以三個問題：

1.是否有可能？

2.如果是，我們可以使用默認值嗎？

3.或者可以在switch語句之外進行操作嗎？提問2

舉例：

switch(stuff) { 
    case 'something': 
     some event; 
     break; 
    case 'the case that could be add by the default element': 
     some event that could happen only after the code was executed 
    default: 
     magic code that would add another case element 
} 

舉例問題3：

switch(stuff) { 
    case 'something': 
     some event; 
     break; 
    case 'the case that could be add by the magic code': 
     some event that could happen only after the code was executed 
    default: 
     some default event 
} 

magic code that would be executed after the switch and that would add a case 

Answer 1

你真的不能編寫JavaScript代碼，這樣它會修改本身，而是你可以編寫一個開關語句，某些情況會在最初被忽略，然後「開啓」：

var enableCase = false; 

switch(true) { 
    case stuff === 'something': 
     // some code; 
     break; 
    case enableCase && stuff === 'the case not initially enabled': 
     // some code 
     break; 
    default: 
     // turn on previous case: 
     enableCase = true; 
     break; 
} 

說，我真的不建議這樣做。根據您正在嘗試解決的潛在問題，幾乎可以肯定有一個更明智的方法來實現這一點。也許用一個if/if else/else塊來測試在別處設置的標誌。