圖像更改功能，如果塊錯誤

Question

我有問題的腳本來更改頁面上的圖像基於從下拉菜單中選擇一個選項。當我有一個下拉改變一個圖像時，我可以使它工作。但我試圖展開我的代碼，以便我可以從單個下拉菜單中替換兩個圖像，但我不確定代碼有什麼問題。

<script> 
window.onload=function() 
{ 

    bp='http://www.nessasneedles.co.uk/images/layout/shop/samples/fabric/', //base url  of your images 
    imgnum=4, //Number of your images. This should match on your comboboxes options. 
    thumb1=document.getElementById('outer_example'), //id of your outer image that will  be changing. The outer of the bag 
    thumb2=document.getElementById('lining_example'), //id of the image using in the if  clause for second image 
    combobox1=document.getElementById('outer_option'), // id of your combobox. The  select box for the outer design. 

    combobox1.onchange=function() 
    { 
    thumb1.src=bp+'img'+this.value+'.jpg'; 

    if (this.value = "Cats") { 
     thumb2.src=bp+'img'+"Purple Gingham"+'.jpg'; 
    } else { 
     thumb2.src=bp+'img'+"Pink"+'.jpg'; 
     };  
    }; 

}

Answer 1

你需要一個雙==在你的if語句：爲比較分配的值，雙==

if (this.value == "Cats") { 

單=。