Javascript:以前的属性未定义

Question

为什么在“creditText”这一行说“lbp is undefined”？如何在这样的配置文件中引用以前的属性？

var lbp = {

    // Pertinant page properties, such as Author, Keywords, URL or Title
    page: {
        theURL: window.location.toString(),
    },

    // Configurable user defaults
    defaults: {
        creditText: lbp.page.theURL
    }
}

预先感谢您的帮助

Answer 1

你不知道。在对象关闭之前，lbp 不会存在于当前作用域的符号表中。

var lbp = {
    // Pertinant page properties, such as Author, Keywords, URL or Title
    page: {
        theURL: window.location.toString(),
    }      
}; // NOW you can reference lbp by name

lbp.defaults = {
  creditText: lbp.page.theURL
};