obj1 = Object.create({}, { property: { enumerable: true, value: 42 } })
> obj1.property = 56
> 56
> obj1.property
> 42
使用 use strict 会出错.
我想组合多个对象:使用 jQuery.extend():
I want to combine multiple objects: with jQuery.extend():
new_obj = $.extend(true, objN, obj1)
使用 ES6 Object.assign:
with ES6 Object.assign:
new_obj = Object.assign({}, objN, obj1)
在任何情况下,getter 都会变成常规属性,因此可以更改.如何避免?
In any case, the getter turns into a regular property, and therefore it can be changed. How to avoid it?
您可以编写自己的函数来复制属性:
You can write your own function that also copies over property attributes:
function extend(target, ...sources) {
for (let source of sources)
for (let key of Object.keys(source))
Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
return target;
}
但请注意,Object.assign
不这样做是有充分理由的,如果 getter 和 setter 是闭包,它可能会产生奇怪的效果.
But notice there is good reason why Object.assign
does not, it could have weird effects if getters and setters are closures.
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