Question

我写了以下代码，Vue抱怨：

[Vue警告]：未定义属性或方法“事件” 实例，但在渲染期间引用。确保声明被动数据选项中的数据属性。

我不明白为什么无法访问事件？

var app = new Vue({
    el: '#app',
    data: {
        responders: [],
        incidents: []
    },

    mounted: function () {
        this.getIncidents();
    },

    methods: {
        getIncidents: function() {
            console.log('getIncidents');
            var app = this;
            this.$http.get('/api/v1/incidents').then(function(response) {
                // set data
                var incidentsReceived = response.data.map(function (incident) {
                    return incident;
                });
                Vue.set(app, 'incidents', incidentsReceived);
            })
        },

        getResponders: function() {
            console.log('fetchResponders');
            var app = this;
            this.$http.get('/api/v1/responders').then(function(response) {
                // set data on vm
                var respondersReceived = response.data.map(function (responder) {
                    return responder
                });
                Vue.set(app, 'responders', respondersReceived);
            });
        }
    }
})

Answer 1

public static void main(String[] args) { Scanner sathya1 = new Scanner(System.in); System.out.println("Enter the numbers"); int x = (sathya1.nextInt()); int y = (sathya1.nextInt()); int addition = x+y; int subtraction = x-y; int multiplication = x*y; float division = x/y; if(sathya1.nextInt(addition){ System.out.println("The number is " +addition); elseif(sathya1.nextInt(subtraction)){ System.out.println("The number is " +subtraction); elseif(sathya1.nextInt(multiplication)){ System.out.println("The number is " +multiplication); elseif(sathya.1nextInt(division)){ System.out.println("The number is " +division); } } } } }用于内部组件数据建模，而props可以在外部分配，使用组件的data键定义。

换句话说，试试：

props

有关组件属性的完整文档，请参阅official guide。

Answer 2

编辑：第一次没有很好地阅读代码。验证响应中是否包含数据，如果没有，则不将其设置为事件数组。

VueJS2属性未定义

2 个答案: