Question

假设，object1有10个对象。此代码将object1分配给object2

const object2 = Object.assign(object1);

但我想只使用for循环从object1分配5个对象。

for (let i = 0; i < 5; i++) {
    object2 = Object.assign(object1[i]);
}
// but this one won't work.

有什么想法吗？

Answer 1

我假设obj1和obj2都是数组

var obj1 = []
    for (let i=0; i< 10; i++)
    {
        obj1.push({key: i});
    }
    var obj2 = []
    for (let i=0; i< 5; i++)
    {
        obj2.push(obj1[i]);
    }

我假设你正在学习Object.assign()。它用于克隆或修改原始对象到目标对象

    var obj1 = {key:1, foo: 'bar'};
    var obj2 = Object.assign({}, obj1);    //clone all properties
    var obj3 = Object.assign({foo: 'not bar', newprop: 'anything'}, obj1);    //copy the original, modify `foo` property and add `newprop`
    //you can iterate through properties with this
    for (var property in obj3) {
    if (obj3.hasOwnProperty(property)) {
          // do stuff, may be filter which property you want to get, etc
        }
    }

在javascript中的Object.assign（object1 [i]）

1 个答案: