嵌套的條件語句（如果，然後再次切換）

Question

快速問題：這種嵌套可能嗎？ if語句首先傳遞一個開關，然後傳遞另一個if語句，所以它不會影響其他未在開關上捕獲的值？

var cookie = ""; //some value previously setted by filtering a cookie, like a product id 
var prod = ""; 
var img = ""; 
if ((cookie != null) && (prod != '')) { 
    switch (cookie) { 
    case '001': case '002': case '003': 
     prod = "Product01"; 
     img = "product01.jpg" 
     break; 
    case '004': case '005': case '006': 
     prod = "Product02"; 
     img = "product02.jpg" 
     break; 
    case '007': case '008': 
     prod = "Product03"; 
     img = "product03.jpg" 
     break; 
    case 'null': 
     break; 
    } 
    if (window.location.pathname == 'somepage') { 
     //jQuery code 
    } else if (window.location.pathname == 'anotherpage') { 
     //jQuery code 
    } else { 
     //jQuery code 
    } 
} 

Answer 1

是的。 你可以寫類似

if (condition){ 
    switch(n) 
    { 
    case 1: 
     execute code block 1 
     break; 
    case 2: 
     execute code block 2 
     break; 
    default: 
     code to be executed if n is different from case 1 and 2 
    } 
} 

也

switch(n) 
    { 
    case 1: 
     if (condition) 
     { 
     code to be executed if condition is true 
     } 
     break; 
    case 2: 
     execute code block 2 
     break; 
    default: 
     code to be executed if n is different from case 1 and 2 
    } 

..well我不會顯示所有的情況下...

隨便看看這裏http://www.w3schools.com/js/js_switch.asp這裏http://www.w3schools.com/js/js_if_else.asp你會發現更多關於else語句的細節。正如有人在評論中悲傷：嘗試一下！ 通常這是理解的最佳方式。