te')); return $arr; } /* 遍历用户所有主题 * @param $uid 用户ID * @param int $page 页数 * @param int $pagesize 每页记录条数 * @param bool $desc 排序方式 TRUE降序 FALSE升序 * @param string $key 返回的数组用那一列的值作为 key * @param array $col 查询哪些列 */ function thread_tid_find_by_uid($uid, $page = 1, $pagesize = 1000, $desc = TRUE, $key = 'tid', $col = array()) { if (empty($uid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('uid' => $uid), array('tid' => $orderby), $page, $pagesize, $key, $col); return $arr; } // 遍历栏目下tid 支持数组 $fid = array(1,2,3) function thread_tid_find_by_fid($fid, $page = 1, $pagesize = 1000, $desc = TRUE) { if (empty($fid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('fid' => $fid), array('tid' => $orderby), $page, $pagesize, 'tid', array('tid', 'verify_date')); return $arr; } function thread_tid_delete($tid) { if (empty($tid)) return FALSE; $r = thread_tid__delete(array('tid' => $tid)); return $r; } function thread_tid_count() { $n = thread_tid__count(); return $n; } // 统计用户主题数 大数量下严谨使用非主键统计 function thread_uid_count($uid) { $n = thread_tid__count(array('uid' => $uid)); return $n; } // 统计栏目主题数 大数量下严谨使用非主键统计 function thread_fid_count($fid) { $n = thread_tid__count(array('fid' => $fid)); return $n; } ?>javascript - [Vue warn]: Error in created hook: "TypeError: Cannot set property of undefined" - Stack Overflow

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    programmeradmin4浏览0评论

    I am creating a VueJS application. I have a child ponent, Child.vue to which data is passed from a parent.

    Child.vue

    export default{

    props:['info'],

    data: function(){
        return{
            timeValue:{
                minutes: '',
                hours: ''
            }
        }
    },
    created: function(){
        
        console.log("Printing inside created of Child ",this.info);
        this.convertMins(this.info[0][2]);
        
    },

    methods:{
        convertMins: (minutes) => {
            console.log("Printing inside convert mins", this);
            if(minutes===0){
                this.timeValue.minutes = 0;
                this.timeValue.hours = 0;
            }
            if(minutes===60){
                this.timeValue.hours = 1;
                this.timeValue.minutes = 0;
            }
            if(minutes>60){
                this.timeValue.hours = Math.floor(minutes/60);
                this.timeValue.minutes = minutes % 60;
            }
        }
    }

}

    I am creating a VueJS application. I have a child ponent, Child.vue to which data is passed from a parent.

    Child.vue

    export default{

    props:['info'],

    data: function(){
        return{
            timeValue:{
                minutes: '',
                hours: ''
            }
        }
    },
    created: function(){
        
        console.log("Printing inside created of Child ",this.info);
        this.convertMins(this.info[0][2]);
        
    },

    methods:{
        convertMins: (minutes) => {
            console.log("Printing inside convert mins", this);
            if(minutes===0){
                this.timeValue.minutes = 0;
                this.timeValue.hours = 0;
            }
            if(minutes===60){
                this.timeValue.hours = 1;
                this.timeValue.minutes = 0;
            }
            if(minutes>60){
                this.timeValue.hours = Math.floor(minutes/60);
                this.timeValue.minutes = minutes % 60;
            }
        }
    }

}

    And my parent ponent looks like this,

    Parent.vue

    import Child from './Child.vue';

export default {
data(){
	return{
        info:[ ],

        errors: []
	}
},

created: function(){

  this.accessInformation();
},

methods: {
    
    accessInformation: function(){
    axios.get(localhost:3000/retrieveInfo)
    .then(response =>{
    console.log(response.data.rows[3]);
    this.info.push(response.data.rows[3]);
   })
   .catch(e => {
            this.errors.push(e);
   })
 }
},

ponents: {								
    'child': Child,
    
  }
}
    <template>
 <div>
   <child v-bind:info="info" v-if="info.length > 0"></child>
 </div>
</template>

    When I try running the application, I get an error like this,

    Why I am getting this error? I am new to VueJS. Can someone please help me out here?

    • javascript
    • html
    • vue.js
    • vuejs2
    • vue-ponent
    Share Improve this question asked Nov 28, 2017 at 6:13 CoderPJCoderPJ 1,0116 gold badges20 silver badges44 bronze badges
    Add a ment  | 

    2 Answers 2

    Reset to default 6

    Don't use arrow functions to define methods. See the warning box at https://v2.vuejs/v2/guide/instance.html#Data-and-Methods

    this in an arrow function refers to the parent context, so here it's referring to the window object, not the Vue object.

    Instead of convertMins: (minutes) => {}, use convertMins(minutes) {}.

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