对象的javascript数组成员

Question

I would like to create in javascript an object that contains an array of other objects. ie

var xobj = {
    d: 0,
    e: 0,
    f: 0
};

var topObj = {
    x: [],
    a: 0,
    b: 0,
    c: 0
};

topObj.x[0].d = 1;
topObj.x[0].e = 2;
var xx = topObj.x[0].d + topObj.x[0].e;

console.log( xx );

I would like topObj.x to be an array of xobj .

I am getting:

Uncaught TypeError: Cannot set property 'd' of undefined

Answer 1

您可以这样做，但是必须用对象（xobj）的实例填充数组：

topObj.x.push(xobj);

Answer 2

if you wanted just the values in the xobj to be appended to the array I would create something like this

for (prop in xobj) {
    topObj.x.push(xobj[prop])
}