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我使用lodash和angularfire2通过用户数据的阵列试图loop属性“DB”,但我得到错误类型错误:无法读取未定义错误类型错误:无法读取的不确定
典型推动的特性“DB”阵列 [ 0:用户1, 1:USER2, 2:用户3, ]
import { AngularFireDatabase} from 'angularfire2/database';
import { AngularFireAuth } from 'angularfire2/auth';
import * as firebase from 'firebase/app';;
import * as _ from 'lodash';
constructor(
private db : AngularFireDatabase,
private afAuth : AngularFireAuth) {}
addGroupChats(allGroupMember) {
console.log("allGroupMember", allGroupMember);
//this line work well without error
console.log("value[0]", allGroupMember.users[0]);
//let endpoint = this.db.object(`/users/${allGroupMember.users[0]}/groups/${allGroupMember.groupUid}`);
//endpoint.set(true);
this line throws ERROR TypeError: Cannot read property 'db' of undefined
_.forEach(allGroupMember.users, function(value) {
let endpoint = this.db.object(`/users/${value}/groups/${allGroupMember.groupUid}`);
endpoint.set(true);
});
}
另外,在使用时的打字原稿迭代使用lodash的是没有意义的/ ES原代码可以写成更简洁只是akkGroupMember.users.forEach(用户=> ...) –
真。 。取决于为什么OP已经将lodash包括在第一位.. –
@ChristianBenseler谢谢,我会检查出来 – netx