将变量用作javascript数组的一部分

我有一个对象（我可以更改！），看起来像这样：

var pageContent = {
    "contact_us":[{
        "content":"<p>Lots of content here.</p>",
        "title":"Contact Us"
     }],
    "index":[{
        "content":"<p>Some other content here.</p>",
        "title":"Home Page"
     }],
    "gallery":[{
        "content":"<p>Some more content</p>",
        "title":"Gallery"
     }],
 }

var newPage = "gallery";
pageContent.newpage[0]['title'];

var title = pageContent[newpage][0]['title'];

获取“Gallery”的值

我想做的是这样的：

var pageContent = {
    "contact_us":[{
        "content":"<p>Lots of content here.</p>",
        "title":"Contact Us"
     }],
    "index":[{
        "content":"<p>Some other content here.</p>",
        "title":"Home Page"
     }],
    "gallery":[{
        "content":"<p>Some more content</p>",
        "title":"Gallery"
     }],
 }

var newPage = "gallery";
pageContent.newpage[0]['title'];

var title = pageContent[newpage][0]['title'];

但是，显然这是失败的。我怎么能做我想做的？欢迎对任何内容进行更改，此处没有任何内容是一成不变的。

您可以使用，如下所示：

var pageContent = {
    "contact_us":[{
        "content":"<p>Lots of content here.</p>",
        "title":"Contact Us"
     }],
    "index":[{
        "content":"<p>Some other content here.</p>",
        "title":"Home Page"
     }],
    "gallery":[{
        "content":"<p>Some more content</p>",
        "title":"Gallery"
     }],
 }

var newPage = "gallery";
pageContent.newpage[0]['title'];

var title = pageContent[newpage][0]['title'];