javascript - 向 Javascript 对象添加属性

Question

这个问题已经有答案了:

Self-references in object literals / initializers (31 个回答)

已关闭 4 年前。

myTable.div 将返回“div_undefined”。当我改变时div: 'div_' + this.name至div: 'div_' + myTable.name它会抛出一个错误:

Uncaught TypeError: Cannot read property 'name' of undefined at :3:26

。有什么想法吗？

var myTable = {
   name: 'tablename',
   div: 'div_' + this.name
}
console.log(myTable.div);

Answer 1

您可以首先声明您的对象，然后添加div属性:

myTable.div = 'div_' + myTable.name;

请记住，如果您选中 MDN Object reference，则对象始终可以使用更多属性进行扩展。 你可以看到:

In JavaScript, objects can be seen as a collection of properties. With the object literal syntax, a limited set of properties are initialized; then properties can be added and removed.

演示:

var myTable = {
  name: 'tablename'
};
myTable.div = 'div_' + myTable.name;
console.log(myTable);