例如,从这两个对象:
var object1 = {
"color": "yellow",
"size" : null,
"age" : 7,
"weight" : null
}
var object2 = {
"color": "blue",
"size" : 51,
"age" : null
}
我想要这个(对象2覆盖对象1,除了null属性或他没有的属性):
{
"color": "blue",
"size" : 51,
"age" : 7,
"weight" : null
}
angular.extend(object1,object2)有效,但会将age属性覆盖为null
答案 0 :(得分:11)
您可以在调用extend之前删除对象2中的null属性。
var myApp = angular.module('myApp',[]);
var object1 = {
"color": "yellow",
"size" : null,
"age" : 7,
"weight" : null
}
var inside = {
"name": "me",
"age" : 9,
"nothing": null
}
var object2 = {
"color": "blue",
"size" : 51,
"age" : null,
"inside" : inside
}
function removeNullIn(prop, obj)
{
var pr = obj[prop];
if(pr === null || pr === undefined) delete obj[prop];
else if(typeof pr === 'object') for (var i in pr) removeNullIn(i, pr);
}
function removeNull(obj)
{
for (var i in obj) {
removeNullIn(i, obj);
}
}
removeNull(object2);
var mergedObject = angular.extend(object1, object2);
console.log(mergedObject);
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.9/angular.min.js"></script>
答案 1 :(得分:3)
您可以将此函数用作自定义扩展机制,而不是本机angular.extend。
/**
* Extends dst with props from src
* @see
* customExtend({a: 1, test : 1}, {b: 1, test : 2});
* //this will return {a: 1, b: 1, test: 2}
* @returns {Object}
*/
var customExtend = function (/* [emptyObject], dst, src */) {
var $$args = Array.prototype.slice.call(arguments, 0);
if ($$args.length === 3) {
$$args.shift();
}
for (var i in $$args[1]) {
if ($$args[1][i] !== null || angular.isUndefined($$args[1][i])) {
$$args[0][i] = $$args[1][i];
}
}
return $$args[0];
};
angular.customExtend = customExtend;