将多个属性添加到现有的js对象
我想向具有现有属性的现有对象添加多个属性。每个新属性有一个比每行更简洁的方式吗?在MDN将多个属性添加到现有的js对象
myObject.name = 'don';
myObject.gender = 'male';
一切都显示了如何做括号来新的对象,而不是现有对象:https://developer.mozilla.org/en-US/docs/JavaScript/Guide/Working_with_Objects
从How can I merge properties of two JavaScript objects dynamically?
var obj2 = {name: 'don', gender: 'male'};
for (var attrname in myobject) { myobject[attrname] = obj2[attrname]; }
编辑
要了解如何可以扩展对象使用此功能更清楚一点:
//Extend the protype so you can make calls on the instance
Object.prototype.merge = function(obj2) {
for (var attrname in obj2) {
this[attrname] = obj2[attrname];
}
//Returning this is optional and certainly up to your implementation.
//It allows for nice method chaining.
return this;
};
//Append to the object constructor function so you can only make static calls
Object.merge2 = function(obj1, obj2) {
for (var attrname in obj2) {
obj1[attrname] = obj2[attrname];
}
//Returning obj1 is optional and certainly up to your implementation
return obj1;
};
用法:
var myObject1 = { One: "One" };
myObject1.merge({ Two: "Two" }).merge({ Three: "Three" });
//myObject1 is { One: "One", Two: "Two", Three: "Three", merge: function }
var myObject2 = Object.merge2({ One: "One" }, { Two: "Two" });
Object.merge2(myObject2, { Three: "Three" });
//myObject2 is { One: "One", Two: "Two", Three: "Three" }
注意:您当然可以根据您的需要实行灵活的合并冲突策略。
使用jQuery库
jQuery.extend(myObject, { name : 'don', gender : 'male' });
不幸的是不能使用jQuery。 (像主要不幸)虽然这看起来超级干净... – 2013-05-07 19:50:27
这个问题没有标签[标签:jQuery]。 – 2013-05-07 19:50:31
仅仅用于扩展对象的jQuery是愚蠢的。 – 2013-05-07 19:50:35
有时候,我不喜欢这样写道:
var props = {
name : 'don',
gender : 'male',
age : 12,
other : false
};
for(var p in props) myObject[p] = props[p];
在ECMAScript中5就可以使我们的defineProperties:
Object.defineProperties(myobject, {
name: {
value: 'don'
},
gender: {
value: 'male'
}
});
不幸的是,语法非常冗长,甚至比OP希望精简的原始语言更长。 – 2013-05-07 19:55:21
是的,我想你是对的,当你想防止你的对象发生变异时,这有更多的用处。 嘿嘿,我总是这么做... = P – JimmyRare 2013-05-07 19:57:52
我同意。这是一个很好的功能,只是笨重。 – 2013-05-07 19:59:13
的.push()
方法为我工作在一个*编码营类问题。我不知道这在实际应用中是否可行,但它通过了测试。 这里是很到位:
var myMusic = [
{
"artist": "Billy Joel",
"title": "Piano Man",
"release_year": 1973,
"formats": [
"CS",
"8T",
"LP" ],
"gold": true
}];
这是我进入:
myMusic.push({
"artist": "Metallica",
"title": "Ride the Lightning",
"release_year" : 1984,
"formats": [
"CS",
"8T",
"LP" ]
} // Add record here
);
这里是它显示的输出:
[ {
"artist": "Billy Joel",
"title": "Piano Man",
"release_year": 1973,
"formats": [
"CS",
"8T",
"LP" ],
"gold": true
},{
"artist": "Metallica",
"title": "Ride the Lightning",
"release_year" : 1984,
"formats": [
"CS",
"8T",
"LP" ]
}]
这意味着作为一个答案。原始帖子询问是否有办法一次向现有对象添加多个事物。 – 2016-07-13 20:34:13
等待,但这是一个额外的对象添加到数组。不是一回事。 – Julix 2016-12-08 00:45:33
在ES6/ES2015可以用Object.assign方法
let obj = {key1: true};
console.log('old obj: ', obj);
let newObj = {key2: false, key3: false};
Object.assign(obj, newObj);
console.log('modified obj: ', obj);
You coul d创建一个接收对象和新对象的函数,枚举新对象,更新旧对象。这会更简洁一点。 'update(obj,{name:“don”,gender:“male”})' – 2013-05-07 19:49:56