修復javascript數組初始化

Question

我想用另一個數組初始化一個數組。該數組包含用於加載RSS提要閱讀器的選項。用戶點擊一個選項按鈕來選擇要讀取的RSS類別。基於選擇，我會像這樣初始化feed URL和選項數組。

feeds = feedsnews.slice(0, feedsnews.length); 
options = optionsnews.slice(0, optionsnews.length); 

（整個JavaScript是在文本的末尾）。 然後我將這些數組發送到加載新聞閱讀器的代碼。這似乎只初始化數組中的第一個元素。

用所有元素初始化數組的方法是什麼？數組是否以正確的方式聲明瞭RSS加載器來獲取它們？

下面是代碼：

<script language="JavaScript"> 

     var feedsnews = [ {title: 'Reuters Top News', url: 'http://feeds.reuters.com/reuters/topNews' }, {title: 'Reuters International', 
url: 'http://feeds.reuters.com/reuters/worldNews' }, {title: 'Reuters US News', url: 'http://feeds.reuters.com/Reuters/domesticNews' }]; 
     var optionsnews = { 
     stacked : true, 
     horizontal : false, 
     title : "News" 
     } 

     var feedscat = [ {title: 'Catholic News Agency', url: 'http://www.catholicnewsagency.com/rss/news.xml' }, {title: 'Zenit - English', url: 'http://feeds.feedburner.com/zenit/english' }, {title: 'Zenit - Français', url: 
'http://feeds.feedburner.com/zenit/french' }]; 
     var optionscat = { 
     stacked : true, 
     horizontal : false, 
     title : "Catholic" 
     } 

</script> 

<SCRIPT LANGUAGE="JavaScript"> 

var feeds=feedsnews.slice(); 
var options=optionsnews.slice(); 

function GetSelectedItem() { 

    feeds=feedsnews.slice(0, feedsnews.length); 
    options=optionsnews.slice(0, optionsnews.length); 

    chosen = ""; 
    len = document.f1.r1.length; 

    for (i = 0; i <len; i++) { 
    if (document.f1.r1[i].checked) { 
    chosen = document.f1.r1[i].value 
    } 
    } 

    if (chosen == "") { 
    alert("No Location Chosen") 
    } 
    else if (chosen =="News") { 
    feeds = feedsnews.slice(0,feedsnews.length); 
    options = optionsnews.slice(0,optionsnews.length); 
    } 
    else if (chosen =="Catholic") { 
    feeds = feedscat.slice(0,feedscat.length); 
    options = optionscat.slice(optionscat.length); 
    } 
    else if (chosen =="Community") { 

    } 
    else if (chosen =="Personal") { 

    } 
    else if (chosen =="Professional") { 

    } 
    else { 
    alert(chosen); 
    } 

    $("#snews").load("loadnews.php"); 

} 
</script> 

HTML (for #snews div) 

    <div id="snews" style="position:absolute; top:30px; right: 30px; width: 430px; height: 380px; overflow-y: auto; overflow-x: hidden; background: white;"> 

     <?php require("loadnews.php"); ?> 

    </div> <!-- End snews --> 


PHP (loadnews.php) 

<!-- ++Begin Dynamic Feed Wizard Generated Code++ --> 
    <!-- 
    // Created with a Google AJAX Search and Feed Wizard 
    // http://code.google.com/apis/ajaxsearch/wizards.html 
    --> 

    <!-- 
    // The Following div element will end up holding the actual feed control. 
    // You can place this anywhere on your page. 
    --> 
    <div id="feed-control"> 
    <span style="color:#676767;font-size:11px;margin:10px;padding:4px;">Loading...</span> 
    </div> 

    <script type="text/javascript"> 
    function LoadDynamicFeedControl() { 

     new GFdynamicFeedControl(feeds, 'feed-control', options); 
    } 
    // Load the feeds API and set the onload callback. 
    google.load('feeds', '1'); 
    google.setOnLoadCallback(LoadDynamicFeedControl); 
    </script> 

<!-- ++End Dynamic Feed Control Wizard Generated Code++ --> 

Answer 1

var optionsnews = { 
    stacked : true, 
    horizontal : false, 
    title : "News" 
    } 

// snip... 

options=optionsnews.slice(0, optionsnews.length); 

optionsnews是Object，而不是一個Array。沒有Object.slice方法，因爲對象既沒有數字索引也沒有固有順序。

這是什麼意思.slice() ing？你想達到什麼目的？