用JavaScript返回一个数组奋斗

Question

目前，这两个警报在底部都会返回“undefined”。我不确定这个问题是否是由于我试图提醒错误的事情，我是否刚刚编写了错误或什么，请帮助，将不胜感激:)。

var contents = [ "Loughborough University offers degree programmes and world class research.", "An alternative University", "Yet another University"]; 

function matchContents(contents,pattern) 
{ 
    var c = pattern.toLowerCase(); 
    var d = []; 
    var arraypointer = 0; 
    for(var i = 0;i<=contents.length-1;i++) 
    { 
     for(var j = 0;j<=contents[i].length-1;j++) 
     { 
      if(c.charAt(j)>='a' && c.charAt(j)<='z') 
       if(contents[i].toLowerCase().indexOf(c.charAt(j)==-1)) 
        j=contents[i].length; 
     } 
     d[arraypointer] = i; 
     arraypointer++; 
    } 
} 

alert(matchContents(contents,"LU")); 
alert(matchContents(contents,"other")); 

Answer 1

也许这只是返回数组d的情况。

var contents = [ "Loughborough University offers degree programmes and world class research.", "An alternative University", "Yet another University"]; 

function matchContents(contents,pattern) 
{ 
    var c = pattern.toLowerCase(); 
    var d = []; 
    var arraypointer = 0; 
    for(var i = 0;i<=contents.length-1;i++) 
    { 
    for(var j = 0;j<=contents[i].length-1;j++) 
    { 
     if (c.charAt(j)>='a' && c.charAt(j)<='z') 
     if (contents[i].toLowerCase().indexOf(c.charAt(j)==-1)) 
      j=contents[i].length; 
    } 
    d[arraypointer] = i; 
    arraypointer++; 
    } 
    // function needs to return something 
    return d; 
} 

alert(matchContents(contents,"LU")); 
alert(matchContents(contents,"other"));